Stir-fry pork, yellow onion, most of the scallions, and sesame oil in a large pot over medium heat, about 5 minutes, breaking up the meat and cooking until mostly brown.
Sprinkle on the gochugaru and stir.
Add tamari and fish sauce. Stir again.
Pour in the water (plus bouillon) or broth and bring to a boil over high heat.
Taste broth and adjust seasonings as needed.
Add tofu, shrimp, and zucchini. Cook just until shrimp turns pink and opaque.
Add in the garlic, kimchi (plus juice), and black pepper, and cook 30 seconds more.
Remove from heat. Add eggs and remaining chopped scallions, and serve hot.