MaryJane's Sourdough Buttermilk Biscuits

Lovely and golden brown, these biscuits are light and flaky and delicious. Eat them plain, with butter, or under a generous amount of Number One's Sausage Gravy.

*Picture coming soon!*

MaryJane's Sourdough Buttermilk Biscuits
yield: about 12 biscuits

2 cups flour, plus more as needed
1 teaspoon sea salt
1/2 teaspoon baking soda
2 teaspoons baking powder
1/2 cup butter
1/2 cup buttermilk (about 2 teaspoons lemon juice or vinegar + milk to make 1/2 cup)
1 cup sourdough starter
1 medium egg yolk
1 tablespoon milk

Preheat oven to 425 degrees F. Mix together flour, sea salt, baking soda, and baking powder. Blend in butter with a pastry cutter or fork. Add buttermilk and sourdough starter. Mix well, until soft dough is formed that cleans the sides of the bowl. Turn onto floured surface and knead gently, adding a little more flour if dough is sticky. Roll out dough on a floured surface and cut into biscuits with biscuit cutter. Place on a lightly oiled baking sheet. Cover and let rise for 30 minutes. Beat together the egg yolk and milk, and brush on the top of each biscuit. Bake for 13 minutes, or until golden brown.