Polenta with Spinach and Onions

Boil 4 c. water with a little salt and slowly add 1 c. dried polenta in a stream. Cook on medium for 30–40 mins., stirring frequently. Meanwhile saute 1 small onion, diced, in generous oil. Add 1 lb. fresh spinach and cook until tender. Then pour half the polenta into a greased baking pan, spread the spinach over it, add 1 or 2 beaten eggs and grated cheese if desired (optional), and pour rest of polenta on top. Bake at 400° for about 20 mins. or until set. Cool and cut into squares.