Thinly slice the onion, green onion, and garlic.
Boil the hangover broth ingredients (clams, anchovies, kelp) in water to make a stock.
Heat olive oil in a pan and sauté garlic and green onion.
Pour in the broth, add the purged clams, and cook.
Boil the spaghetti in boiling water.
Add the cooked spaghetti to the pan and simmer with the broth.
Season with salt and pepper to taste.
Plate and garnish with chopped scallions and chili peppers.