Pierogi - cooking recipe

Ingredients

2 1/2 lb. flour (1/2 of 5 lb. bag)
1 c. warm water
1 c. milk
1 egg
1 tsp. salt
5 lb. potatoes
8 slices American yellow cheese
1 stick margarine
1 onion, chopped

Preparation

Cook potatoes.
Drain.
Add cheese.
Saute onion in margarine. Add to potatoes and mash.
Let cool.