Cook the noodles in boiling water then rinse with cold water and set aside.
Add oil to saute pan and heat over medium. Add zucchini and mushrooms, cook 3 minutes. Then add scallions and garlic and cook an additional two minutes. Just to soften the vegetables. Remove from heat and set aside.
Add water with bouillon to a large pot and bring to a boil. Once boiling add tofu, kimchi, chili paste and vegetables and reduce to a simmer for about 5 minutes.
Add udon noodles and cook for another minute or two and your ready to serve. Garnish with some sliced scallions and more chili paste if you need more heat.