8 ounces beef sirloin, fat removed, sliced into 1-inch strips
1 tablespoon soy sauce, reduced sodium
1 quart reduced-sodium or homemade beef stock
2 teaspoons fresh ginger, grated
2 large carrots, shredded, about 1 cup
1/2 head Napa cabbage, about 2 1/2 cups, shredded
6 ounces shiitake mushrooms, tops only, stems removed, sliced, about 1 1/2 cups
1/2 teaspoon sesame oil
2 cups fresh bean sprouts
1 teaspoon Sriracha sauce
1/4 cup cilantro leaves, chopped, optional
3 green onions, chopped, optional