Use mortar and pestle to finely ground sea salt and Sichuan peppercorns.
Pat tofu fry with paper towels. Cut into 1 inch cubes.
Pour enough oil into a large cast iron skillet to reach 1/2-inch depth and heat over medium high. Heat oil to 350°F.
In a bowl, mix cornstarch and 3/4 of the salt and pepper. Coat the tofu in a thin layer of the cornstarch. Working in small batches, fry until golden brown (make sure to turn to cook all sides). Remove and place on a rack sitting inside a baking sheet.
In a wok or separate skillet, heat 1 tbsp of oil on medium high. Add tofu, jalapenos, green onions, a small handful of whole cilantro sprigs, and remaining 1/4 of salt and pepper (add as little or as much jalapeno you would like depending on desired heat level). Toss until greens are just wilted, approximately 3 minutes.
Plate and serve with steamed white rice.