Make this salad when watermelon is at its peak, sugar-sweet and juicy. I prefer basil to the fresh mint typically used in watermelon salad, but feel free to use mint instead.
To make the vinaigrette, combine the orange juice, lime juice, vinegar, shallot, salt, and pepper in a small bowl or jar. Let stand for 10 minutes.
To make the salad, slice off the top and bottom ends of the oranges and place the flat bottom on a cutting board. With a sharp chef’s knife, cut off the peel in strips all the way around the orange, following the cu