Bring water to a boil, add a bit of salt. Turn heat off and add the shrimp, shells on. Cover and let sit for a few minutes until they go from translucent to fully pink/orange.
Shock them in ice, peel and chop into small pieces.
Add the shrimp to a bowl with the cilantro, mango, serrano and onion.
Add in the lemon juice, orange juice, soy sauce, salsa macha, sesame oil, salt and pepper.
Let it marinate for at least 30 minutes.
Avocado-Lime Sauce
Blend the avocado, mayo, squeeze of lime, scallions and salt. Add water to get to desired consistency.
Wonton Tostadas and Assembly
Preheat your oven to 350℉.
Leave your wonton wrappers stacked and, using a sharp knife, cut an X in the middle of the wonton wrappers.
Add oil spray to a baking sheet. Lay out your wonton wrappers and also spray the tops. Bake for 8-12 minutes or until golden.
Assemble by placing your crispy wonton tostadas and topping it with 3 cucumber slices, pipe on the avocado-lime sauce, a spoonful of the shrimp ceviche, sesame seeds, cilantro, another squeeze of lemon and that is it!