This is a buttermilk recipe for 12 servings. You will need 3/4 cup buttermilk, 1 tablespoon canola oil, 1 cup whole-wheat pastry flour, 1 cup all-purpose flour, 1 tablespoon sugar, 1 1/2 teaspoons baking powder and 1/2 teaspoon baking soda, 1/2 teaspoon salt, and 1 1/2 tablespoons cold butter cut into small pieces.Preheat oven to 425 degrees F. Coat a baking sheet with cooking spray, Combine buttermilk and oil. Whisk whole-wheat flour, all-purpose flour, sugar, baking powder, baking soda andsalt in a large bowl. Using your fingertips or 2 knives, cut butter into the dry ingredients until crumbly. Make a well in the center and gradually pour in the buttermilk mixture, stirring with a fork until just combined.Transfer the dough to a floured surface and sprinkle with a little flour. Lightly knead the dough 8 times, then pat or roll out to an even 3/4-inch thickness. Cut into 2-inch rounds and place on the baking sheet. Buttermilk makes the lightest fluffiest biscuits. Bake them for 12 to 16 minutes or until golden brown.