Black Sesame Buckwheat Banana Bread

Name: Black Sesame Buckwheat Banana Bread
Ingredients: 3/4 cup whole spelt flour; 1/2 cup buckwheat flour; 3/4 teaspoon baking powder; 1/4 teaspoon baking soda; 1/2 teaspoon sea salt; 2 tablespoons black or blond toasted sesame seeds, more for sprinkling on top; 1/2 cup coconut sugar or unrefined brown sugar; 2 eggs; 2 teaspoons real vanilla extract; 1/3 cup plain goat kefir or buttermilk; 1/3 cup mild fruity extra-virgin olive oil; 1/2 cup roasted sesame tahini; 3 large ripe bananas, mashed; 2 tablespoons raw sugar, for sprinkling on top