Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Clean or peel, wash and chop broccoli and carrots. Melt 2 tablespoons of butter in a saucepan. Sauté the flour in it until light yellow. Stir in milk, 200 ml water and stock. Bring to the boil, add vegetables, cover and simmer for about 7 minutes.
Melt the gorgonzola in the sauce. Season to taste with salt, pepper and nutmeg. Mix the uncooked pasta with the sauce and put it in a greased casserole dish. Rub Gouda over it and bake everything in a hot oven for about 10 minutes.