Michelle Obama's Shortbread Cookies - Mother Linda's

Ingredients

• 1 cup unsalted butter, softened
• 1 cup sugar
• 1 egg, separated
• 1½ Tbsp. Amaretto
• ¼ tsp. sea salt
• 1 tsp. grated orange rind
• 1 tsp. grated lemon rind
• 2 cups white flour
• ¾ cup slivered almonds