Bun flavorings can include a variety of ingredients, such as sesame seeds. Sesame seeds are small, flat, oval-shaped seeds that come in a variety of colors, including white, yellow, black, and red. They have a nutty flavor and are often used to top buns, breads, and other baked goods. Sesame seeds are also used to make tahini, a paste made from ground sesame seeds that is used in many Middle Eastern dishes.