Heat a wok over low heat, add 2 teaspoons Szechuan peppercorns and cook until fragrant, about 1 minute. Transfer to a bowl, add ½ teaspoon salt to taste and lightly mix. You can mash it with the back of a spoon to extract more flavor.
Transfer to a medium bowl, add 2 tablespoons cornmeal and 12 ounces pork tenderloin, cut into bite-sized pieces. Coat meat with the peppercorn mixture and reserve.
Heat the wok over high heat. Add 2 tablespoons oil around the edges and cook 2 medium carrots in bite size pieces and 1 small leek, coarsely chopped until beginning to brown, 3 or 4 minutes. Transfer to a plate and reserve.
Add about 3 tablespoons oil to the wok, add pork and cook until brown, about 5 minutes. Transfer to the plate with the carrots.
Add 1 tablespoon minced fresh ginger and 2 garlic cloves, minced, to the wok and sauté 1 minute. Add 3 tablespoons soy sauce, 2 tablespoons honey, 3 tablespoons orange juice and 3 tablespoons mirin. Cook until the sauce is somewhat syrupy.
Add the pork pieces and vegetables back to the wok and cook for 1 or 2 minutes, stirring to coat.
Divide 2 cups cooked white rice between two bowls or plates. Add pork mixture on top, dividing evenly. Garnish with 2 tablespoons chopped green onions and serve.