1/3 c. butter
1/3 c. chopped onion
1/4 c. all-purpose flour
1 tsp. salt
1/4 tsp. dry mustard
1 1/2 c. milk
1/2 c. shredded American cheese
1 tbsp. lemon juice
4 eggs, separated
1 (6 1/2 or 7 oz.) can flaked tuna, drained
1/2 c. wheat germ

Saute onion in butter until tender. Blend in flour, salt, and mustard. Add milk; cook over medium heat, stirring constantly, until thickened. Add cheese and lemon juice until melted.

Beat egg yolks; add hot mixture slowly, stirring constantly. Stir in tuna; add wheat germ. Beat egg whites until soft peaks form. Fold into tuna mixture.

Pour into greased 2-quart casserole or souffle dish. Bake at 350 degrees for 45-50 minutes.