Soba Noodle Soup Recipe with Tofu, Sweet Potato, Shiitake Mushrooms and Spinach

http://www.culicurious.com/soba-noodle-soup-recipe/

Ingredients:
4 oz soba noodles
1 T sesame oil
1 t sesame seeds
8 c vegetable stock
2 t kosher salt
1 lg sweet potato, peeled, halved length-wise and cut into 1/8" slices
3 c thinly sliced onion
1 c thinly sliced shiitake mushrooms
1 T sesame oil
8 oz firm tofu, cut into 1/2" chunks
1-6 oz bag baby spinach

While preparing ingredients, heat water to boil the soba noodles.
Once noodles are done, drain and cool with running water. When noodles are cooled and drained, toss with sesame oil and sesame seeds. Set aside for now.
In a soup pot, combine the stock and salt and bring to a simmer.
Add the sweet potato, onion and mushrooms. Stir well and continue to simmer for 10 minutes.
Gently stir in the tofu and cook for an additional 5 minutes. Test sweet potatoes to make sure they're tender.
If sweet potatoes are tender, turn off heat. If not, continue to cook for another 5 minutes.
Once the soup's off the flame, gently mix in the spinach and noodles. Allow to sit for 5 minutes so spinach can wilt and noodles heat then serve.

Notes:

Prep time will be increased if you need to make vegetable stock.