Cranberry

Sit a cranberry in your palm and press it. A good one pushes back. That firmness is the whole point — it tells you the berry is fresh, not going soft and wrinkled. Colour matters too: look for deep red, almost blood-coloured skin, glossy and tight, not dull or shrivelled at the edges.

Raw, cranberries are fiercely sour. That's not a flaw, it's their nature — they carry very little sweetness of their own, which is exactly why they need heat, honey or orange to come alive in a sauce. Cook them gently and the skins burst, and the whole pot thickens on its own, no flour or starch needed.

Some people say cranberries are too sour to eat unless you drown them in sugar. No! Pair them with something fatty — duck, pork, a rich cheese — and the sourness turns into balance, not punishment. Treat them only as a jam base and you'll waste their sharp, cutting edge, the very thing that makes rich food taste lighter. That's the mistake: sugar first, thought second.

For 100g raw, expect 46 kcal, under 12g of carbs, barely any fat or protein — a lean berry doing heavy flavour work.