Swedish Almond Filling

Directions

• Grind the almonds, orange peel, and 6 ounces of the sugar very finely, until almost a
  paste.
• Cream the butter with the remaining 6 ounces of sugar. Gradually mix in the eggs, egg
  yolks, vanilla, and the nut mixture. Be careful not to overmix; if too much air is
  incorporated, the tarts will puff up while baking and then fall in the center, giving them
  an unattractive finished appearance.