Dark Chocolate Tahini Cookies

Tahini in a cookie is not a health substitution. It is there because sesame paste is about fifty per cent fat and intensely savoury, and both of those things do something specific to a chocolate cookie: the fat keeps it fudgy, and the savour stops the sugar from being the only thing you taste.

The result is a cookie that is slightly less sweet and considerably more interesting than the standard, and people usually cannot identify why.

The hour in the fridge

This is the difference between a good cookie and a very good one, and it is worth the wait for two reasons.

The first is spread. Cold fat takes longer to melt, so the dough sets before it flows, and you get a thicker cookie with a chewy middle rather than a thin crisp one.

The second is flavour. Resting lets the flour hydrate fully, and enzymes break some of the starch into simpler sugars. Those sugars brown more readily, which is why chilled dough bakes darker and tastes more caramelised than dough baked immediately. An hour is the minimum; overnight is better and forty-eight hours is the outside edge of useful.

Chopped, not chipped

Chocolate chips are formulated with less cocoa butter and more stabiliser so they hold their shape in the oven. That is exactly the wrong property. A chopped bar gives you shards that dissolve into the crumb, chunks that stay whole, and flat pieces that melt into visible pools — three textures instead of one.

Chop unevenly on purpose.

Underbaked is the target

Pull them when the perimeter is set and the middle still looks wet. There is enough residual heat in the tray to finish the centres, and a cookie baked until the middle looks done in the oven is a cookie that will be dry on the plate.