Place sliced Chayote on a wire rack and lightly salt. Let sit for 10 mins. After 10 minutes, pat it dry to remove any moisture. On one side of each tortilla, place the chayote alternating between this and the zucchini. Place half of the cheese on each tortilla. Fold the tortillas then place them on a hot cast iron pan, on a griddle or in the oven to melt the cheese and crisp the tortilla.