Spicy Pork and Mustard Green Soup

Name: Spicy Pork and Mustard Green Soup
Ingredients: ½ pound ground pork; 2 cloves garlic finely chopped; 2 teaspoons finely grated peeled ginger; 1 teaspoon Sichuan peppercorns, crushed; ¾ teaspoon crushed red pepper flakes; ½ teaspoon cumin seeds, coarsely chopped; 1 tablespoon vegetable oil; Kosher salt and freshly ground black pepper; 4 cups low-sodium chicken broth; 1 bunch mustard greens, torn (about 4 cups); 4 scallions, thinly sliced; 2 tablespoons reduced-sodium soy sauce; 1 teaspoon fish sauce (such as nam pla or nuoc nam); 8 oz. wide rice noodles