Cook the pasta in boiling salted water according to the instructions on the packet. Cook peas in boiling water for 2-3 minutes, drain, rinse with cold water and drain. Wash, clean and halve the tomatoes.
Drain the tuna and pluck it into small pieces. Whisk eggs and milk, season with salt, pepper and nutmeg. Turn the pasta into nests and place them in a greased casserole dish. Mix peas, tomatoes and tuna, spread in the casserole dish.
Pour egg milk over it, sprinkle with cheese. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 30-35 minutes.