2 Tablespoons cognac, or sherry or ¼ cup dry white wine
Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 3-quart casserole dish.
Melt ¼ cup butter in a medium-size skillet; Add onions and green peppers; Sauté’ until tender.
In another pan, melt the remaining ¼ cup butter and blend in the flour. Gradually add milk and cook constantly until thickened.
Stir in the onion, green pepper mixture. Season with mustard, salt, garlic, and Parmesan cheese.
Add in the shrimp and Crab meat and either the cognac, sherry or wine. Make sure all is mixed well.
Pour into buttered casserole dish and bake 1 hour at 350 degrees F.