In a pot with water, bring to a boil and cook your pasta. If they instruct to cook for 10 minutes, cook for 8 as they will keep cooking with the rest of the ingredients.

At the same time heat a pan over medium heat with some olive oil, add the garlic and let it cook for 20 seconds then add the clams, stir and cover for 2 minutes. Add the mussels, stir and again cover for 5 minutes. At this point all mussels/clams should be opened, if there are some unopened ones, discard them. Reserve mussels in a bowl.

Add the shrimp, wine, juice from lemon and butter, and let it simmer for about 2 minutes. Add the tomatoes and half the parsley.

Drain the pasta but reserve about 1/2 cup of the water ( you can adjust consistency with it if needed) and add to the mix. Add mussels and clams and mix well.