When you've got too much citrus and too little time, one of the easiest, most satisfying things to make is a mixed-citrus, whole-fruit jam. This one uses limequats, oranges, lemons, and a grapefruit; make yours with whatever you have on hand.
My natural first thought was marmalade, but it’s an awful lot of work and my time was decidedly short. Then I remembered citrus jam. It’s something I’ve made in the past with grapefruit to delicious results.