This is a recipe from my mother-in-law which we make every Christmas. They are traditionally a very hard cookie and delicious when enjoyed with a cup of coffee.
Sand Tarts 
4 c flour 1/2 tsp baking powder
2 c sugar 1/2 c whiskey
3 eggs 1 tsp nutmeg
Combine all ingredients and refrigerate to chill overnight.
Have ready:
1/2 c cinnamon sugar
egg whites
Roll dough very thin (about 1/8 inch) and cut into diamond shapes. You may cut with cookie cutters if desired. Brush with egg whites. Sprinkle with cinnamon sugar. Place half an almond or pecan on each cookie and brush again with eggs whites. Sprinkle with a little more cinnamon sugar. Bake at 350F for 10 – 12 minutes. As the cookies cool they harder further.
[...] tree decorating, Christmas cookies are made – the same year after year – Sugar Cookies, Sand Tarts, Angel Wings, Cocoons, Bourbon Balls and Nut Clusters. The evening of the party, we have a buffet [...]