Fish, vegetables or fruit sealed in a clear bag and opened at the table: a little theatre with very little washing-up.

These are Carta Fata cooking bags, made from the transparent heat-resistant film the brand is known for, cut to a handy individual-portion size and packed fifty to a box.

Inside the bag food cooks in its own steam, so juices and aromas stay where you want them instead of on the oven floor.

Fill with a fillet of sea bass, cherry tomatoes, olives and a splash of wine, seal, bake, and let the guest open it. Follow the maker's guidance on temperatures.