Leftover Spaghetti Casserole - cooking recipe

Ingredients

1 onion
1/2 c. chopped celery
4 Tbsp. butter
1 Tbsp. flour
1/2 c. milk
2 c. leftover roast beef, cubed
3 c. cooked spaghetti
1 small can mushrooms
1 c. tomato sauce
1 tsp. Worcestershire
grated cheese

Preparation

Saute onion and celery in butter in skillet until tender. Blend in flour.
Stir in milk.
Cook until thick, stirring constantly.
Add remaining ingredients except cheese.
Pour into casserole.
Top with cheese.
Bake at 350\u00b0 for 25 minutes.