In a sauce pot, bring water, crab boil, and salt to a boil. Cook shrimp thoroughly, drain and cool. When shrimp has cooled, rough chop into small pieces.
Combine all remaining ingredients except French bread. Add shrimp.
Spread a thick layer of shrimp mixture onto French bread rounds. Place rounds on a baking sheet and freeze. When completely frozen, transfer to an airtight plastic bag.
To cook: Preheat oven to 350. Remove from freezer. Place on baking sheet and cook 15 minutes.
Makes 25-30 toasts.