Use a 1:2 ratio custard filling:almond paste. Place desired amounts of custard and almond paste in a stand fitted with the paddle attachment and mix on 2nd speed until no lumps remain. Slice and/or pit stone fruit. Brush puff squares with egg wash. Be careful not to go over the edges. Create a pinwheel: 1..On each square, slice a 2-inch cut from each corner in toward the center; fold every other tip in toward the center (pressing firmly), forming the pinwheel shape. Place a dollop of almond filling into center of pinwheel. Layer stone fruits on top of almond filling. Bake at 400°F until puff is rich golden brown. Glaze with apricot glaze while pastry is still warm.
To make egg wash, use a ratio of 2:1 whole eggs:water. For example, for every pound of eggs used, add 8oz water. Mix together and add a pinch of salt if desired.