Slice onion, garlic, and Cheongyang chili thinly.
Purge and clean the clams thoroughly.
Cook spaghetti noodles in salted water, then drain.
Heat olive oil in a pan and sauté garlic, onion, and chili.
Add hangover broth (anchovy or kelp broth) and bring to a boil.
Add clams and mung bean sprouts; cook until the clams open.
Add the cooked spaghetti, then season with salt and pepper.
Plate and garnish with chopped green onions.