In the heart of winter, when produce can be less exciting than summer, the key is to go for the heartier greens that still maximize crunch. Here youve got three winter all-stars: leafy escarole, bitter endive, and herbal fennel. Use a mandoline to shave the fennel into ultra-thin slices. If you dont have one, its worth running your knife over a honing steel a couple times for a clean edge. Letting the shallot mellow and pickle slightly in the vinegar is a smart trick to use anytime youre using raw onion or shallot. It takes some of the bite out and helps tame any potential onion breath.