Celebrate Mardi Gras with a Prune, Coffee, and Almond Galette des Rois - California Prunes

Ingredients

• 2 sheets store-bought puff pastry (or homemade; see note)
• ¾ cup prunes
• ⅔ cup water
• 3 tbsp brown sugar
• 1 tsp vanilla extract
• ½ tsp espresso powder
• Large pinch of salt
• 6 TBSP unsalted butter (room temperature)
• ¼ cup + 2 TBSP granulated sugar
• ¼ tsp salt
• 2 egg whites
• ¼ tsp almond extract
• ½ cup almond flour (or finely ground blanched almonds)
• 1 TBSP + 1 tsp all-purpose flour
• 2 egg yolks
• Dash of cream or half-and-half