Making an orange Bundt cake that produces a tender, moist, and rich confection is relatively easy—making one with an assertive orange flavor is more of a challenge. For a sufficiently zesty Orange Bundt Cake recipe, we pumped up the flavor with a bit of thawed frozen orange concentrate. Along with lemon juice and orange zest, it gave our glaze its rich, potent flavor. A final dusting of granulated sugar and orange zest added another level of citrus flavor and gave our Orange Bundt Cake a pleasant crunch.