Preheat oven to 450 degrees.
Grease baking sheet.
Sift together flour, baking powder, cream of tartar, sugar and salt.
With pastry blender, cut in shortening until mixture resembles coarse meal.
Beat egg lightly and add to milk.
Add liquid and mix with fork until dough holds together.
Turn dough out onto floured board and knead lightly, just until dough is no longer sticky.
Roll out dough 1-inch thick and cut into biscuits.
Bake in preheated oven for 12 minutes.