I bought an ovenproof plate and cooked gratin for lunch. First, cut an onion. Second, mix an onion, shrimps, two spoon of flor, 300ml milk, stock cubes, butter and macaroni in an ovenproof plate. Third, heat in the microwave for 8 minutes. Fourth, add shredded cheese on top. Fifth, heat in the oven for 10 minutes.