You don't need a discard recipe. You need your own recipes, with discard in them. That takes one piece of arithmetic and about thirty seconds.

The rule

Most starters are kept at 100% hydration — fed with equal weights of flour and water. That means:

100g of discard = 50g flour + 50g water

So when you add discard to a recipe, you take those amounts back out of the recipe's own flour and liquid. Nothing else changes.

Worked example

Say you have a pancake recipe calling for 200g flour and 240g milk, and you want to use 100g of discard.

  1. Your discard brings 50g flour and 50g water.
  2. Reduce the flour: 200g − 50g = 150g.
  3. Reduce the liquid: 240g − 50g = 190g milk.
  4. Add the 100g discard with the wet ingredients.

The batter has the same total flour and the same total liquid as before. It will behave almost identically, and taste better.

In cups, if you don't weigh

It's cruder, because a cup of discard varies with how vigorously you stirred it, but it works:

1 cup discard ≈ ½ cup flour + ½ cup water

So for every cup of discard you add, take out half a cup of flour and half a cup of the liquid. If it looks too thick or too loose after mixing, adjust with a splash of liquid or a spoon of flour — batters are forgiving, and the conversions guide has the weights if you'd rather be exact.

If your starter isn't 100% hydration

Some people keep a stiffer starter — fed at 75% or 60% hydration, meaning less water per unit of flour. The rule generalises. For a starter at hydration h (expressed as a decimal), 100g of discard contains:

  • flour = 100 ÷ (1 + h)
  • water = 100 − flour

At 100% hydration (h = 1.0) that gives 50g and 50g, as above. At 75% (h = 0.75) it gives about 57g flour and 43g water. At 60%, about 62g flour and 38g water.

If you've never deliberately changed it, you're almost certainly at 100% and the simple rule applies.

How much can you add?

There's no hard ceiling, but there is a point of diminishing returns.

  • Up to about 25% of the total flour weight — safe in essentially anything. The texture stays where you expect it and you get a clean, mild tang.
  • 25–50% — noticeable. More tender crumb, more sourness, slightly denser. Good in pancakes, quick breads, crackers, flatbreads.
  • Above 50% — you're no longer adapting a recipe, you're writing a new one. The acidity starts to work against structure, and gluten-dependent results get gummy. This is where the dedicated big-batch recipes earn their keep, because they're built for it rather than adapted.

What to adjust once discard is in

Add chemical leavening if there isn't any. Discard is acidic, so it activates bicarbonate of soda on contact. A quarter-teaspoon of bicarb per cup of discard is a sensible starting point in a batter. If the recipe already has baking powder, leave it alone — you don't need both, and doubling up gives a soapy, metallic edge.

Expect faster browning. The sugars and acids in discard push the Maillard reaction along, so things colour sooner. Check five minutes earlier than the recipe says, especially for anything shallow — crackers, pancakes, thin flatbreads.

Rest the batter if you can. Fifteen minutes lets the flour hydrate fully and the lumps disappear, particularly with cold discard straight from the fridge. Overnight in the fridge goes further and deepens the flavour considerably — that's the whole idea behind the overnight pancake method.

Don't reduce the salt. Discard is unsalted, and the tang can read as under-seasoned if you cut the salt to compensate for the sourness. Season as normal.

Things it works in immediately

Pancakes, waffles, muffins, quick breads, banana bread, scones, biscuits, crêpes, cornbread, pizza dough, flatbread, pasta, crackers, batter for frying, and the roux-ish base of a savoury pancake. Anywhere flour and liquid meet, essentially.

Things to be careful with

Delicate cakes — a sponge that relies on whipped-egg structure doesn't love added acid. Keep discard under 20% of the flour weight there, or skip it.

Yeasted bread you want to rise on schedule — adding discard adds acid without adding useful lift, and the timing gets unpredictable. That's a starter job, not a discard job.

Anything already tangy — buttermilk, yoghurt, soured cream. You can stack them, but taste as you go; two sour notes can tip a recipe from pleasant to sharp.

Where to go next