Salmon lasagne | NunnaUuni

Ingredients

• 500 g of salmon fillet
• 2 teaspoons of salt
• 12 spinach lasagne sheets
• 1 onion
• 4 dl of mushrooms
• 150 g frozen spinach
• 2 tablespoons of oil
• 1 teaspoon of salt
• ½ teaspoon of black pepper
• 30 g butter or margarine
• ½ dl of wheat flour
• 7 dl of milk
• 100 g of green pepper processed cheese
• 1½ teaspoons of salt