Buttermilk biscuits

This batch of biscuits, while tasty, didn't rise nearly as much as it should have. I think that means it's time for new baking powder.

2 cups all-purpose flour
1 tablespoon baking powder
pinch of salt
1/4 cup shortening
1/2 stick cold butter, cut into pieces
3/4 cup buttermilk

Whisk the dry ingredients together in a bowl. Using a pastry blender, cut in the butter and shortening until it resembles coarse crumbs. Using a fork, work in the buttermilk.

Turn out the dough on a floured surface and gently roll into a 1-in tall rectangle. Cut biscuits. Place on an ungreased baking sheet and bake at 400 for 30 minutes. Brush with melted butter, if you like.