3 tablespoons fresh lemon juice
1 1/2 tablespoons rice vinegar (not seasoned)
1 1/2 tablespoons sugar
3/4 teaspoon kosher salt
3 tablespoons olive oil
3/4 pound jicama, peeled and cut into thin matchsticks
3 cups flat-leaf parsley leaves (from 2 bunches)
2 cups celery leaves (from about 2 bunches)
6 scallions, thinly sliced
1 1/2 cups radish sprouts (from a 3-ounces package)