Multigrain English Muffins

Name: Multigrain English Muffins
Ingredients: ½ cup warm water (115 degrees); 1 tablespoon honey; 2 teaspoons active dry yeast (from one ¼-ounce envelope); 1 teaspoon unsalted butter, plus more for serving (optional); 2 cups all-purpose flour, plus more for surface; ¾ cup whole-wheat flour; ¼ cup rolled oats; ¼ cup wheat germ; 1 tablespoon coarse salt; 2 teaspoons whole flaxseed; 1 ½ teaspoons caraway seeds (optional); ½ cup low-fat buttermilk; Vegetable oil, cooking spray; ¼ cup coarse cornmeal; Preserves, for serving (optional)