Citrus Yogurt Cake

This is my go-to loaf cake for any occasion or no occasion at all. It's moist, the slices hold up, and the flavor is delicious. I have made it with all different kinds of citrus: lemon, orange, grapefruit (as in the original), lime, key lime, tangerine, and even kumquat. I have made it with 100% all-purpose flour, almost 100% whole wheat pastry flour, and usually a mixture of the two. I have made it with nonfat, full-fat, and Greek yogurt. I once made it dairy-free and it was still great. Sometimes I add random berries (raspberry, blueberry) or other fruit (pear) into the batter. This cake, it never disappoints.

A version of the very adaptable citrus yogurt cake with lemon
and poppyseed.