Preheat oven to 425 degrees F (220 degrees C). Place 1 tablespoon butter in two 10-inch cast iron skillets.
Place skillets in the preheated oven to heat up and melt butter, 5 to 10 minutes.
Mix buttermilk and eggs together in a small bowl.
Combine flour, baking powder, cream of tartar, and salt in a large bowl. Rub in remaining 6 tablespoons butter with your fingers until mixture is crumbly. Gently stir in buttermilk mixture until dough just starts to come together.
Turn dough out onto a lightly floured work surface. Pat into a rectangle about 1/2 inch thick. Cut dough into 24 biscuits.
Remove skillets from the oven. Arrange 12 biscuits side-by-side in each, their edges touching.
Return skillets to the oven and bake until biscuits are puffed and lightly browned, 15 to 20 minutes.
If you like the bottoms softer, allow the skillets to cool briefly before adding biscuits in step 6.
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