Crab with Dill on Cayenne Toasts

Preheat oven to 350 °F. Stack bread slices and cut off crusts. Quarter slices to make twenty-four 1 1/2-inch squares and arrange squares on a baking sheet. In a small saucepan melt butter and stir in cayenne and salt. Brush tops of squares with butter mixture and bake in middle of oven until pale golden, about 10 minutes. Cool toasts on a rack. Toasts may be made 1 day ahead and kept in an airtight container at room temperature.