Heat olive oil in a saucepan, add wine and lemon juice, when mixture starts to boil, place shrimp in pan an cook on medium heat until shrimp curls and they are done. Remove shrimp but leave wine mixture in pan. In the same saucepan add onion and garlic salt, sauté until the onions are transparent. Add flour and water paste, stir and cook until sauce is thick. Pour cream in sauce, stir, add the cheeses one at a time and whisk constantly after each addition. Sauce should be a medium thick consistency and smooth, if sauce is too thick add a little water and whisk. Remove from heat.
Place Italian bread on serving tray in an X. Arrange shrimp in the middle of the placed bread. Spoon sauce in the middle of the bread covering the shrimp. Sprinkle with sliced green onions, olives, and tomatoes. Sprinkle crushed red pepper on top. Sprinkle more Parmesan cheese on top if you would like.Makes 4 Source: