Blackberries cooked down with restraint, finished short of sweet. The tartness sits on the edge of bitter, which is exactly where you want it for a real preserve.

Slather a hot biscuit. Fold it into whipped cream. Spoon it on a wedge of stilton with toast. The kind of jam that knows what it is and doesnt try to be jelly.

For the friend who keeps three jams in the fridge and rotates them. The host whose cheese board is always interesting. A small jar that earns return purchases.

Jamagansett cooks in small batches in Amagansett, with East End blackberries.