Combine 1 T. each: rice vinegar and water with 1/2 tsp. lime juice, 1/2 tsp. minced garlic, a pinch of red pepper flakes, 1/8 tsp. orange zest. Refrigerate 4 hours or overnight. Toss dressing with 3/4 cup grated jicama and half an orange (sliced), and serve on 2 green leaf lettuce leaves.