Begin by preparing the anchovy clam broth. In a pot, bring water to a boil. Add dried anchovies, dried kelp, and onion. Boil for 20 minutes until the broth has reduced by half. Toss in the large clams and boil until they've opened up.
Remove the clams and transfer the clam meat into a blender with 2 tablespoons of broth. Blend until it forms a wet paste.
Strain the broth and set aside.
In a heavy-duty pot, like an earthenware pot, heat oil over medium-low heat. Add the white part of scallions and sauté for 2 to 3 minutes.
Turn the heat to the lowest setting, then add gochugaru and make sure to consistently stir for 2 to 3 minutes to prevent the chili flakes from burning.
Add the blended clam meat and mix it into the gochugaru. Pour in the anchovy clam broth. Stir and mix everything together well.
Toss in the zucchini, onions, garlic, and fish sauce. Let this boil for 2 to 3 minutes.
When the veggies are tender, add squid, small clams, and silken tofu. Gently break the tofu apart with a spoon. Boil for another 2 to 3 minutes.
Top with an egg and garnish with the green part of scallions and peppers!