Add 1 tbsp sesame oil to a small soup pot. Warm to medium heat and add the diced onion, minced garlic and ginger. Cook, stirring often, for 3-4 minutes until softened.
Add the sliced mushrooms and saute for 2-3 minutes.
Add the vegetable stock (or vegetable boullion and water) and miso paste. Bring to a simmer (turn up the heat if needed) and cook until miso is dissolved, about 4-5 minutes.
Add udon noodles, tamari and spinach and cook 3-4 minutes until noodles are warmed through.
Turn off the heat and stir in the tofu. Taste and add more tamari if needed. Pour into a bowl and serve topped with chopped green onions.
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Notes
Want to make this for more than one person? Use the handy tool in the recipe card, under 'servings,' you can adjust to 2 servings, 4 servings etc.Need more broth? Simply add in towards the end and just simmer the soup for 2-3 more minutes to meld the flavours.If you like single-serving recipes, check out these recipes: Black Garlic Ramen & Single-Girl Pasta Bowl AKA The JLO Pasta