Tuna Potato Casserole - cooking recipe

Ingredients

4 c. sliced potatoes
1/4 c. flour
3 Tbsp. butter, melted
2 Tbsp. mustard
2 c. milk
1 tsp. salt
1/8 tsp. pepper
1 (7 oz.) can tuna
1 c. thinly sliced onions

Preparation

Cook potatoes in boiling water for 10 minutes; drain.
Blend flour into butter in double boiler.
Stir in mustard, milk and seasonings.
Cook until smooth and thick, stirring frequently. Layer potatoes, tuna and onions in greased 2-quart casserole, alternating all 3 ingredients.
Pour sauce over top.
Bake at 350\u00b0 for 45 minutes.