All sorts of flavors are possible here, from sweet-tart lemon-lime to coffee to coconut, and they’re all perfect on a summer day or when you want something light and refreshing. Freshly squeezed juice is the best, of course; otherwise, use nectar if it’s available. Try unexpected juices like cherry, peach, nectarine, plum, apricot, mango, or passion fruit. To adjust the sweetness of the gelée, replace some of the simple syrup with water, juice, fruit purée, or other liquid. I tend to like my gels set on the loose side, more like a flan. It still holds its shape on the spoon, but it’s delicate and melts immediately in your mouth. If that sounds appealing, use 3 tablespoons agar flakes. For a jiggle akin to Jell-O, use 4 tablespoons. Then you can make cubes or cookie-cutter shapes- great for kids.