Prepare the shepherd's purse by trimming and roughly chopping it.

Slice the zucchini into half-moons, chop the green onion diagonally, and dice the onion and tofu.

In a pot, add the broth and dissolve the soybean paste.

Add zucchini and onion to the broth and bring to a boil.

Season the broth with soy sauce, chili powder, and minced garlic, then add the prepared shepherd's purse.