3 hr 30 min — Medium — Spanish
Four cups of tomato skins, seeds, and pulp — the scraps left from a big batch of sauce or canning — combine with two cups of sugar and a pinch of sea salt to produce a thick, sliceable preserve. The natural pectin in the tomato solids does the work that quince would do in a Spanish-style membrillo, binding the mixture into a firm paste over about three and a half hours. Cooled and unmolded, it cuts into neat slices alongside aged cheese or cured meat. Sixteen servings from what would otherwise go in the compost.