Soaking the lasagne sheets in water first ensures they will cook quickly. For this recipe you will need a shallow 1.8 litre/3¼ pint ovenproof dish. Preheat the oven to 200C/180C Fan/Gas 6.

Swirl it through to create an even layer. Layer over 4 lasagne sheets, breaking them to fit snugly and cover the sauce. Repeat with another third of the tomato sauce, a further quarter of the ...