1/3 c. chopped onion
1/4 c. melted butter
1/4 c. flour
1 tsp. salt
1/2 tsp. white pepper
1 c. half & half
1 c. milk
2 tbsp. lemon juice
1 (6 oz.) pkg. frozen crabmeat, thawed and flaked
1 c. peeled deveined shrimp
1 (5 oz.) can water chestnuts, drained and sliced
2 c. cooked rice
2 tbsp. chopped pimentos
1 c. shredded Cheddar cheese

Saute onions in butter until tender. Add flour, salt, and pepper; cook until bubbly. Gradually add half & half and milk, stirring constantly. Cook over low heat until smooth and thickened. Remove from heat. Add rest of ingredients (reserve 1/2 cheese). Stir to blend; spoon into lightly greased 2 quart casserole. Sprinkle with cheese. Bake at 325 degrees for 30 minutes.