All-Natural Kosher Freshness Dated Non-Irradiated Taste That Makes A Difference You can feel good about the superior flavor of Frontier seasonings. We source our spices from growers committed to quality, sustainability and ethical trade. An indispensable ingredient in baking, cream of tartar—when combined with baking soda and water—acts as a leavening agent in cakes, quick breads and souffles. To aid in stiffening egg whites, add a pinch when beating.