Step 1

Place large pot over medium heat; add olive oil. Stir in diced onion; cook and stir until onions begin to turn translucent, 3 or 4 minutes. Add chorizo; cook and stir to render some fat, about 3 minutes. Add garlic and cook 1 minute. Pour in white wine.

Step 2

Raise heat to high and bring liquid to a boil. Immediately add clams and distribute evenly. Cover and cook until clams open, about 7 minutes. During this time you can occasionally shake the pot to "stir" the clams using potholders or a kitchen towel to hold the pot handles. It's best not to open the lid and stir.

Step 3

When clams have opened, remove pot from heat. Stir in butter and parsley; allow butter to melt. Serve clams in heated bowls with lots of the liquid.