Soup:
1 tablespoon sesame oil
½ medium red onion, thinly sliced
1 clove garlic, minced
2 teaspoons minced ginger
5 cups vegetable broth
2 tablespoons lime juice
1-2 tablespoon sriracha*
2 tablespoons soy sauce
3 cups cubed sweet potatoes
2 ounces soba noodles

Toppings:
Bean Sprouts
Cilantro
Lime Juice
Toasted Sesame Seeds