This recipe is a mash-up of two very popular Korean stews - yukgaejang and soondubu. Yukgaejang is a spicy beef stew filled with vegetables and vermicelli noodles and soondubu is a soft tofu stew. Combined to make the ultimate Korean comfort stew!
Soak brisket in cold water for 30 minutes to draw out blood. Soak gosari, shiitake mushrooms, and glass noodles to rehydrate.
Drain soaked brisket and add to a pot with fresh water (~4 cups), 1/2 onion, 2 garlic cloves, and ginger. Cover and simmer for 30-45 minutes. Remove beef, strain and reserve broth.
Drain gosari and boil for about 30 minutes. Drain and cut into 2-3 inch long pieces.
Prep the rest of the vegetables: wash mungbean sprouts, slice soaked shiitakes mushrooms, baton scallions, and mince remaining garlic.
When the brisket is cool enough to handle, shred along the grain into strips.
Into an earthenware or heavy-bottomed pot, add sesame oil, chili flakes and garlic on low heat for 1 minute to bloom.
Add in the rest of the vegetables and beef and mix until well combined.
Pour about 2-2.5 cups of reserved beef broth. Season with salt and soup soy sauce and simmer for about 20 minutes.
Add in soft tofu and noodles. Cook for another 5 minutes.