Preheat your oven to 300°F (150°C). Liberally grease two 8x4-inch loaf pans or one 9x5-inch loaf pan.
In a large bowl, whisk together the dry : rye flour, cornmeal, whole wheat flour, salt, and baking soda.
In a separate medium bowl, whisk together the wet : buttermilk (or yogurt) and molasses (or maple syrup).
Pour the wet into the dry .
Stir with a spatula just until the batter is combined and no dry streaks remain. Be careful not to overmix. If using, gently fold in the raisins.
Pour the loose batter into your prepared loaf pan(s).
Bake for 60-75 minutes, or until a toothpick inserted into the center of the loaf comes out clean.
Let the bread cool in the pan on a wire rack for 10 minutes before carefully removing it to cool completely.
Serve warm for the best experience!
Don't Overmix: For a tender, soft crumb, mix the batter just until the are combined. Overmixing can lead to a tough, dense bread.