Step 1

In a medium saucepan, bring 4 cups water to boil over medium-high heat. Add wontons and gently stir with a spatula, and make sure that they don't stick to the bottom of the pot. Cook until water begins to boil again, about 2-3 minutes. Add 1/2 cup cold water and bring to a boil again. Cook until the wontons float to the top, about 2 minutes. Transfer the wontons to a plate with a strainer.

Step 2

Mix together the chili oil, soy sauce, vinegar, garlic, Sichuan peppercorn powder (optional), and sugar.

Step 3

Slowly pour the chili oil sauce over the wontons and gently stir to coat the wontons. Sprinkle peanuts, sesame seeds and cilantro on top. Serve immediately.