Make the frangipane: Combine frangipane ingredients in a food processor or blender. Blend until smooth.
56 grams unsalted butter, 75 grams cane sugar, 60 grams egg whites, 75 grams almonds, 20 grams vanilla, 9 grams all-purpose flour
The mixture will make more than you need in the recipe, store leftovers in a jar in the refrigerator.
Make sugar syrup: Combine water or wine and granulated sugar in a small saucepan over medium low heat. Cook, stirring until sugar dissolves completely, about 2 minutes. Stir in vanilla.
50 grams cane sugar, 56 grams water, 8 grams vanilla
Prep: Preheat the oven to 350 F. Line a baking sheet with parchment paper.
Assemble Bostock: Brush sugar syrup liberally on both sides of the bread. Spread 1 tablespoon of preserves or jam on one side of the bread. Layer 1 tablespoon of almond paste and a sprinkling of flaked almonds on top.
4 thick slices of enriched bread, 113 grams simple syrup, 56 grams homemade blueberry preserves, 56 grams almond paste, 15 grams flaked almonds
Bake: Bake Bostock for 15 to 20 minutes or until almond paste appears golden brown.
Serve: Sprinkle powdered sugar over Bostock before serving. Bostock is best enjoyed the same day it's baked.
powdered sugar
Store: Bostock will keep well for up to 3 days stored in an airtight container at room temperature.