I just discovered "The Original Bakewell Cream" which is an old-fashioned leavening still made in Maine. Here is the recipe on the label, and we've had great success with it. I'm now a huge fan of Bakewell Cream!
INGREDIENTS
4 c flour
4 tsp Bakewell Cream
2 tsp baking soda
1 tsp salt
1/2 c shortening
1 1/2 c cold milk
Mix and sift dry ingredients.
Add shortening and mix with pastry blender.
Add milk all at once, and stir quickly with a fork. (Some flours may require a little more liquid to make a nice soft dough.)
Turn out on floured board and knead 5 or 6 times.
Roll or pat to 1/2" to 3/4" thick. Cut with biscuit cutter.
Bake at 475° for 5 minutes.
Turn off heat and leave in oven for 5 - 10 minutes until golden brown.
Serve hot.
These biscuits are extra high and light. The label says that to substitute for 1 tsp baking powder, use 2/3 tsp Bakewell Cream and 1/3 tsp baking soda. To substitute for cream of tartar, use as is.