Preheat oven to 235°F (113°C).

In a large bowl, sift together flour and baking powder.

In a separate bowl, cream shortening and sugar until light and fluffy.

Blend in egg yolks, vanilla extract, almond extract, and lemon extract. Mix well.

Gradually add the dry ingredients to the wet ingredients and mix until dough is well blended.

Roll dough into small, round balls using about 1 teaspoon of dough per ball.

Place dough balls on an ungreased baking sheet.

Flatten each ball slightly with a spoon.

Bake for 20 minutes, or until lightly golden.