A bit of effort involved, but so worth it! I made this exactly as posted. It was a little time-consuming, though, between zesting and juicing. Even though I sprayed my tube pan liberally with Baker's Joy, it stuck a little bit when removing from the pan. The cake is incredibly moist and spongy, and the glaze takes it over the top. I probably ended up adding 1/2 cup or so of grapefruit juice to the glaze to get it to a pouring consistency. This is a real keeper! Made for Culinary Quest 2014.