4 white fish fillets, about 100 g each (I use cod, Tilapia would work well too) 3 tbsp butter 1/4 cup finely chopped onion 3 tbsp flour 1 cup milk 3/4 cup grated cheddar cheese 1/2 tsp salt paprika Arrange fish in a single layer in a buttered Pyrex. Melt butter in casserole. Add onion and flour, saute... more