A cup of sourdough starter, discard or active, turned into twelve lemon muffins in half an hour.

If you keep a starter you already know the problem: every feeding produces discard, and there is a limit to how many pancakes anyone wants. This is one of the better answers.

Discard works as well as active starter

The recipe says either, and it means it.

The lift here comes from baking soda, not from the starter. Sourdough starter in a quick bread contributes flavour and acidity rather than rise, so whether it is bubbling and freshly fed or has been sitting in the fridge for a week makes very little difference to the texture.

Older discard is more sour, which some people prefer against the lemon. Fresh starter is milder. Both work.

Baking soda, not baking powder

One teaspoon, and the choice is deliberate.

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Baking soda is a base and it needs an acid to react with. Sourdough starter is acidic, and so is the lemon juice. Between them there is plenty for the soda to work against, and the reaction produces the rise.

Baking powder contains its own acid and would work too, but it would not use the acidity already in the batter, and you would lose some of the tang that makes these taste of sourdough.

The reaction starts as soon as the wet and dry meet, so get the batter into the tin reasonably promptly.

Zest and juice both

The zest of one lemon and a tablespoon of juice.

They do different jobs. Zest holds the aromatic oils, which is where lemon flavour actually lives and which survives baking. Juice contributes acidity that reacts with the baking soda and brings a sharpness that zest alone does not.

One without the other is noticeably flatter. Zest only the yellow, since the white pith beneath is bitter.

Fold, do not beat

Dry ingredients folded into the wet until just combined.

The standard muffin rule and it matters here as it always does. Overworking develops gluten and gluten in a muffin gives you a tough, chewy, tunnelled crumb instead of a tender one.

Lumpy batter is the correct stopping point. Streaks of flour are not.

Two thirds full, fifteen to twenty minutes

Paper liners, cups filled about two thirds, 350F.

Two thirds leaves room for the rise without spilling over the edges. These rise reasonably well for a quick muffin, so filling to the top gives you spread rather than dome.

Fifteen to twenty minutes is a wide range and it depends on your tin and oven. Start checking at fifteen with a toothpick. Muffins go dry quickly past done, since there is not much fat holding moisture in.

Cool in the pan briefly, then move them

A few minutes in the tin, then out onto a wire rack.

Left in the tin, the muffins steam against the hot metal and the bottoms go damp. Moved too early, they are fragile and the paper liners peel away with the muffin still attached.

A few minutes is the window. When the tin is cool enough to touch with bare fingers, they are ready to move.

Additions worth making

Fresh blueberries or raspberries fold in well and lemon takes to both. Add them at the very end after the flour, and toss them in a spoonful of the dry mixture first, which stops them sinking to the bottom.

Poppy seeds are the other obvious one. A tablespoon gives lemon poppy seed muffins with no other changes.

Keeping them

Two to three days in an airtight container at room temperature. They freeze for up to three months. <p>Around 200 calories each, which makes them a reasonable breakfast rather than a dessert pretending to be one. ## If you do not keep a starter This recipe is built around having discard on hand and there is no direct substitute for the flavour. A cup of plain yogurt plus a quarter cup of flour approximates the acidity and consistency, though you lose the fermented note that makes these worth making.

Doubling

The recipe doubles cleanly to twenty four muffins. Bake in two batches rather than crowding two tins onto one shelf, which blocks airflow and bakes unevenly.