Cornmeal Crust: Combine flour, cornmeal, and butter in food processor and add water in a fine stream, processing constantly until the dough forms a ball. Shape into disc and wrap in plastic. Chill for about 1 hour.
Preheat oven to 425 degrees F.
Shape into 6 balls, roll into circles and line individual 4 1/2-inch tart molds. Place on baking sheet and prick with fork. Bake until crisp, about 10 minutes. Let cool on wire rack.
Oyster Filling: In a saute pan, sweat leeks and herbs in butter until leeks are soft. Add sherry and let reduce until almost dry. Add cream and paprika. Just before serving, add oysters and liquor, and cook until oysters just begin to curl.
When the oysters have cooked, pour the mixture into the tart shells and serve immediately.