2 tablespoons canola oil
2 scallions, thinly sliced, white and green parts separated
2 cloves garlic, chopped
1 tablespoon chopped fresh ginger (from a 1-inch piece)
1 pound ground pork
1/2 pound shiitake mushrooms, stems discarded and caps thinly sliced
kosher salt
4 cups low-sodium chicken broth
1 tablespoon fish sauce or soy sauce
4 ounces wonton wrappers (about 10), sliced into 1/2-inch strips
2 tablespoons fresh lime juice, plus lime wedges for serving
sliced red chili peppers and cilantro leaves, for serving