How To Render Tallow And Dripping: The Fat Your Butcher Pays To Throw Away

Every butcher in Britain is paying somebody to take away the best cooking fat in the country.

Fat that does not go into a pie, a sausage or a suet block stops being food the moment he decides not to sell it. It becomes a Category 3 animal by-product, which is the legal class for material passed fit for human consumption at slaughter and then not sent there for commercial reasons. It cannot go in the bin, it cannot be buried and it cannot go to landfill. It goes into a sealed container, a licensed collector takes it away, and the butcher pays for that service. When the rules came in, the Scottish butchers’ federation told its members in February 2004 that councils had begun enforcing the ban on animal waste and bones going to landfill, and that the charges could add £2.5m to the costs of Scottish meat retailers.

The same substance, rendered and sat in a jar with a farm name on the label, is £8.75 for 275g in Ocado. That is £31.82 a kilo. The anonymous 250g block of British dripping in Tesco is £1.25, and Sainsbury’s own dripping, sold to make your Sunday roast potatoes British, is packed in Poland.

Beef fat in this country therefore trades at anything from a negative price to £31.82 a kilo, and the only variable in the equation is who happens to be holding it.

So ask. Most butchers will hand over a carrier bag of it for nothing and look faintly puzzled that anybody wants it, because you have just volunteered to shrink their disposal bill. The UK carnivore shopping list covers how to ask without sounding like you are angling for a discount, and the British beef cuts guide covers where on the animal the stuff comes off. Neither of those needs repeating here.

What nobody has ever written down is what to do with the bag when you get it home.

The fats are not interchangeable

Five things get handed over the counter under the general heading of fat, and they render into five different products. Asking for the wrong one and then cooking with it is how people conclude they do not like tallow.

Beef suet. The hard fat from around the kidneys and up the loin. Dry, crumbly, pale, almost no water in it and almost no meat attached. It renders into tallow that sets bone-white and hard enough to knock on, and it smells of very little: a faint clean beefiness and nothing else. It gives the highest yield of any beef fat and it keeps the longest, because purity is what keeps. This is the fat for deep frying, for pastry, for searing, for skin balm, and it is the only one worth using for pemmican, which needs a fat so dry and so hard that there is nothing left in it to spoil.

Beef trim and cod fat. The softer fat off the outside of the muscle and out of the groin, which is what the trade calls cod fat and what you should ask for by name if you want to be handed the good stuff without a conversation. It arrives with meat and membrane on it and a fair bit of water in it. It renders yellower, softer and lower-yielding, and it comes out tasting emphatically of roast beef. This is dripping rather than tallow. It is what you want on toast, in Yorkshire puddings, and under roast potatoes.

Both of those are beef and they will not give you the same jar. Suet gives you a fat that behaves like an ingredient. Trim gives you a fat that behaves like a flavour.

Pork leaf fat. Also called flare fat, from around the pig’s kidneys, and it looks like a thin sheet of white felt. It renders into the whitest, softest, most neutral lard you will ever handle, with barely a whisper of pig in it. This is the pastry fat. Shortcrust made with leaf lard is the reason your grandmother’s pastry was better than yours, and no amount of technique closes that gap.

Pork back fat. Firmer, and it tastes of pig all the way through. Excellent for confit, sausages, frying and roasting, and it will make the kitchen smell of bacon for a day. Do not use it for anything sweet.

Lamb and mutton fat. The hardest of the lot. It has the highest melting point, it sets like candle wax at room temperature, and it will still taste unmistakably of sheep after two strainings. It disappears into nothing and it is not meant to. Superb with lamb, on flatbreads, and under roast potatoes if you are the sort of person who likes that. Render 500g of it before you commit to 3kg, because opinion in most households splits hard down the middle.

Dry against wet, and why the oven wins

There are two ways to get fat out of tissue. Dry rendering is fat alone in a low oven until it melts out of the connective tissue holding it. Wet rendering is fat in a pan with a few centimetres of water, where the water caps the temperature at 100°C and cannot let anything scorch.

Dry is the default, for four reasons that all matter.

Flavour is the first and the biggest. The gentle browning of the solids is where dripping gets its character, and water rinses that out on purpose. Wet-rendered fat comes out pale and mild, which is a virtue in soap and a loss in a roasting tin.

The second is that the failure wet rendering prevents is one the oven already prevents. Scorching happens because a pan bottom sitting on a gas ring goes to 200°C while the fat above it is still at 80. An oven at 120°C cannot do that to you no matter how long you leave it.

The third is that wet rendering does not finish the job. You chill it overnight, lift the cake of fat off the jelly underneath, and then still have to melt it again and drive off the water that soaked into it. That second stage is exactly the step where people get impatient, and residual water is the single commonest reason a jar of home tallow goes rancid.

The fourth is the scratchings, and I will come back to those, because wet rendering turns them into grey pulp and you lose them entirely.

Water is the right call in four situations. If you are rendering for balm, soap or skincare and want it snow white and odourless. If your input is filthy, very meaty trim and you want a mild fat out of a rough starting point. If you have no oven and one temperamental gas ring. And if you are trying to civilise mutton fat, where washing some of the flavour out is the entire point. In all four cases, render wet, chill it, lift the cake, then remelt dry and hold it at low heat until it stops bubbling. You have to do the dry stage eventually. The only question is whether you do it first or last.

The method, and the numbers

Get it minced if the butcher will run it through a coarse plate for you, because minced fat renders in about two thirds of the time and gives a better yield. If not, dice it to roughly 2cm. Half an hour in the freezer first turns it from something that squirms under the knife into something that cuts like cold cheese.

Heavy casserole or a deep roasting dish, no lid, fat no more than 6cm deep. Oven at 120°C conventional, or 100°C if yours is fan only. Nothing added. No water, no salt, no oil in the bottom of the pan.

Timings for a 2kg bag:

• Suet, diced to 2cm: 3.5 hours
• Suet, coarse minced: 2 to 2.5 hours
• Trim and cod fat, diced: 4 to 4.5 hours, because of the water it carries
• Pork leaf: 2 hours, it gives up almost immediately
• Lamb: 4 hours, and it wants the low end of the temperature

Stir it every 45 minutes or so. There is nothing else to do.

What it looks like as it goes. First hour, a shallow pool of clear fat and pieces beginning to shrink. Second hour, half the volume is liquid and the whole surface carries a fine, steady bubbling. That bubbling is water leaving, and it is the most useful thing in this entire article, because it means you can hear and see the one variable that decides whether your jar lasts a year or a fortnight. Third hour, the solids have shrivelled to pale gold flecks and start to sink.

It is done when the surface goes quiet. No bubbling, no fizzing, no hiss. The liquid is clear enough to read the bottom of the dish through, and the solids have sunk and stopped moving. Do not wait for them to go brown, because brown means you have gone past it.

Strain it hot, through a fine sieve lined with two layers of muslin, into a warm dry jar. Warm and dry both matter. Hot fat into a cold jar can crack it, and hot fat into a damp jar puts back the water you have just spent four hours removing.

The yields, by weight. Diced beef suet gives back about 80%, so a 2kg bag returns around 1.6kg of tallow and a tray of scratchings. The same weight of trim gives closer to 65%, around 1.3kg, with a good deal more residue and a much better smell in the house. Pork leaf runs highest of anything, a little over 80%. If you want to work backwards from how much fat you need, the rendering calculator does the sum by weight and fat type.

The four ways it goes wrong, and how to spot each one while it is happening

Too hot. The sound tells you first. A gentle render makes a soft, occasional simmer. Frying makes a sharp continuous crackle and spits at you, and the moment you hear that, the pieces are cooking rather than melting. The edges of the solids darken quickly, the smell goes from roast beef to the back end of a roast beef, and the fat itself slides from straw to strong tea. Get the dish out, let the temperature drop, and strain immediately, because scorched solids carry on flavouring the fat for as long as they sit in it. Colour and burnt flavour do not come back out again. You have made a usable cooking fat with a strong opinion, which is fine in chips and wrong in pastry.

Water left in it. While it is happening, the tell is that the surface never goes fully quiet, and you take it out anyway because it has been four hours and you want your oven back. Afterwards, the jar reads cloudy rather than clear, a bead or a wet layer appears at the bottom after a night in the fridge, and the fat spits violently in a hot pan. All three mean the same thing. Remelt it gently, hold it until the bubbling stops and the surface is still, and strain it again through fresh muslin into a dry jar. Water is not a cosmetic fault. It is the difference between a fat that sits in a cupboard for a year and one that turns while you are still working through it.

Oxidised. You will smell it before anything else: putty, linseed, the inside of a freshly opened tin of emulsion. On the tongue it goes waxy first and then bitter at the back. This one cannot be fixed and cannot be cooked around, and a jar that smells of paint goes out. It gets there three ways: stored warm and in daylight, stored in a jar that is mostly air, or reheated over and over. The Britannia block carries the warning that the product may bleach if exposed to direct light, which is a manufacturer admitting the same thing in smaller print.

Dirty fat. Fat that has been fried in picks up crumbs, and the crumbs turn long before the fat does. Strain it back through muslin while it is still warm after each use, and retire it once it has darkened noticeably or smells of whatever you cooked in it last week.

The scratchings are your wage

What sits in the sieve at the end is the best thing that happens all afternoon, and most people tip it down the food waste. The old British word for it is greaves, which tells you it was once valuable enough to have a name.

Press the residue against the sieve with the back of a spoon to get the last of the fat out, spread it on a tray, and put it back in at 200°C for 10 to 15 minutes until it crackles. Salt it while it is hot. Beef gives you something dark, chewy and intensely savoury that no bag in a pub has ever matched. Pork gives you proper crackling. Lamb gives you something strong enough that you will make it once and then talk about it for a while.

Keep them in a jar and eat them inside a few days. They hold moisture and they carry meat, so they soften and turn far faster than the fat does. Eat them while they crack.

One rule: never salt the tallow itself. Salt attracts water, water is the thing you have spent four hours removing, and salted tallow is a jar with a clock on it. Salt the scratchings.

Storage, honestly

Purity decides shelf life, not the calendar, and any article that gives you a single number for tallow has not made it. Clean, dry, well-strained tallow with no solids left in it is genuinely shelf stable. British kitchens kept it in an open bowl beside the cooker for generations and nobody died of it.

The honest figures:

• Cupboard, cool and dark: 3 months without giving it a thought
• Fridge: 6 to 12 months
• Freezer: years, and it does not meaningfully degrade
• Dripping with meat juices and sediment in it: 4 to 6 weeks in the fridge

That last one catches people out. The dark jelly at the bottom of a roasting tin is the best-tasting substance in the kitchen and the first thing in the jar to spoil. Sainsbury’s own dripping, which is nothing but dripping, tells you to use it within 12 weeks of opening.

Wide-mouth glass jars, sterilised and completely dry, filled while the fat is liquid and lidded once it has cooled to warm. Straight-sided tubs or silicone moulds for the freezer. An ice cube tray gives you 15g blocks, which is about one steak. Fill jars to the top rather than half filling big ones, because air is what oxidises fat and a half-empty jar is mostly air.

To check a jar you are unsure about, smell it cold, then melt a teaspoon in a warm pan and smell it again. Heat drags the off notes out of hiding. Fresh tallow smells of almost nothing. Turned tallow smells of a decorator’s van. Yellow staining across white tallow, a grey bloom on the surface, or a sharp cheesy edge all mean it is finished. Visible mould means water got in somewhere, and the whole jar goes rather than the top centimetre.

What to do with the jars

Suet tallow for steak, for chips and for anything that needs real heat. Dripping for the roast, for potatoes, for Yorkshires and on toast with salt. Leaf lard for pastry. The hardest, driest, whitest tallow goes to pemmican.

British kitchens ran on this fat until an industry with a marketing budget persuaded them it was killing them. The bowl by the cooker went in the bin. The cows carried on producing the fat at exactly the same rate, because nobody told the cows, and it now leaves the back of every butcher’s shop in a sealed container at the butcher’s expense.

Two kilos of it costs you four hours of doing essentially nothing and returns 1.6kg of the best cooking fat in the country, a jar of scratchings, and a house that smells like a Sunday. The butcher will thank you for taking it away.