Buttered Buttermilk Biscuits

3 1/2 cups ground spelt flour
1 cup buttermilk
4 TBs melted butter
1 1/2 ts sea salt
2 ts baking soda
unbleached white flour
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Mix flour and buttermilk to form a thick dough. Cover and leave in a warm place for 12-24 hours. Knead and add remaining ingredients. Roll dough on the floured surface and cut biscuits. Bake at 350 - 370 degrees for about 20-30 minutes. Serve with butter, cheese, jams, meats, soup.