Spinach Casserole - cooking recipe

Ingredients

1/2 cup butter
1/2 cup flour (matzo cake meal for Passover)
1/2 teaspoon salt
1/4 teaspoon pepper
2 cups milk
3 (10 ounce) packages frozen chopped spinach
1/2 teaspoon grated onion (or to taste, grated onion goes very far)
1/2 teaspoon Worcestershire sauce (or to taste)
1/2 cup fine dry breadcrumb (matzo meal, not matzo cake meal, for Passover. This amount is an approximation)

Preparation

Melt butter, blend in flour, salt & pepper, stir and bubble one minute.
Remove from heat and stir in milk. Bring to boil, stirring constantly. Boil one minute, stirring.
Drop in still frozen spinach and cook until thawed.
Season with grated onion and Worcestershire Sauce to taste (approx 1/4 to 1/2 tsp each. Start small and taste as you add. A little goes a long way.).
Place in casserole, top with buttered bread crumbs. (Buttered bread crumbs: 2-3 Tbsp butter, melted, pour in fine, dry bread crumbs.).
Bake at 325F (or 350F) for at least one hour.
Passover 1965 - 8 pkgs spinach, double sauce recipe, made 3 1/2 quarts.
Passover 1970 - 6 pkgs spinach, double sauce recipe, made 3 quarts.