Wash and shell shrimp and remove veins.
Wash again in cold water.
Dry.
Dust with flour.
Put oil and butter in flat baking dish and heat under low heat in broiler until butter is melted.
Add shrimp and broil under low heat for 8 minutes.
Add sauce, stir to coat and broil under high heat for 2 to 3 minutes.

To make sauce:
Melt butter.
Add flour, pepper, lemon juice, hot water and white wine.
Bring to boil stirring constantly, and cook 5 minutes.
Add 5 T. butter and stir until melted.
Just before pouring over shrimp, add garlic and parsley.