Onions peel, finely dice. Peel garlic and chop finely. Saffron with 50 ml of boiling water and let stand. Put spinach and 100 ml water in a pot. Cover and heat up at medium heat for 14-16 minutes.
Bring to the boil briefly, stirring several times. Pour into a sieve and drain. In the meantime wash the fish, pat dry, cut into 8 slices and sprinkle with lemon juice. Season with salt and pepper.
Turn in 2 tablespoons of flour. Heat 2 tablespoons of oil in a frying pan and fry the fish for about 3 minutes on each side. Take out and keep warm. Fry half of the onions in the frying fat until transparent. Dust with 1 tbsp. flour, sweat and deglaze with saffron water, stock and milk.
Bring to the boil while stirring, season to taste with salt, pepper and sugar and simmer for 2-3 minutes. Meanwhile prepare noodles in boiling water according to instructions on the packet. Heat 1-2 tablespoons of oil in a saucepan, sauté remaining onions and garlic in it, add spinach, heat and season to taste with salt, pepper and nutmeg.
Stir the prawns into the sauce, add the fish and heat. Pour pasta into a sieve, quench and drain. Arrange noodles, spinach and fish with sauce on plates.