Spicy Mushroom Soup

Ingredients

• 4 quarts rich beef stock (homemade preferred, or very low sodium broth, if you don't make your own)
  
• 1 ounce dried mushrooms, reconstituted in hot water to cover by 1 inch
  
• 1 pound assorted mushrooms, chopped
  
• 6 large scallions, cut into 2-inch segments
  
• 1 ¹/₂ teaspoons salt/MSG, or to taste
  
• 1 tablespoon chopped garlic
  
• 1 tablespoon Korean red pepper powder, or to taste
  
• 1 tablespoon sesame oil
  
• 2-3 tablespoons gochujang, or to taste
  
• 3 cups Napa cabbage, thinly sliced
  
• 1 package thin rice noodles, reconstituted in warm water
  
• ¹/₂ package firm tofu, drained & cut into 1/2-inch cubes