In a large pot, heat oil over medium heat. Add onion, garlic, carrots, celery, ginger, curry powder and soy sauce. Cook, stirring occasionally, until vegetables are softened, about 5 minutes.
Add vegetable stock and bring to a boil. Reduce heat to low and simmer for 10 minutes.
Add udon noodles and cook for 5 minutes, or until noodles are tender.
Add peas and spinach and cook for an additional 2 minutes.
Garnish with cilantro and serve.
Interesting Facts
Udon noodles are a type of thick, wheat-based Japanese noodle.
This soup is a great way to use up any leftover vegetables you have.
This soup can be easily adapted to suit your tastes, just add your favorite vegetables.