i made 10gal heffe last week, to one carboy i added 5 tangelos and one red grapefruit (i wanted do do blood oranges but couldnt find them), i peeled the fruits, steeped the peel in 180F or so water (just to cover the peel) for 15min, cut the rest of the fruit in to small pieces, pulverized with potato masher then mixed everything with liquid from steeping and dumped in the fermenting beer (around 48h after pitching), i dont know how it taste but im gona take a sample today for og reading, from color and fruit taste if i would do it again i would just use red grapefruits. All this was inspired but recipe in extreme brewing by Sam Calagione