Mix 2 cups flour, 2 teaspoons sugar and 3/4 teaspoon each baking soda and kosher salt in a bowl. Work in 2 tablespoons diced cold butter by hand. Add 1/2 cup raisins and 1 tablespoon caraway seeds. Mix in 3/4 cup buttermilk. Pat out the dough until 1 inch thick; cut into four to six 2 1/2-inch rounds. Bake at 375 degrees F, 15 to 20 minutes.