This is a mediterranean sauce for pasta, it's very simple. As you may know from my profile I don't use garlic and onion, but I will write the recipe for garlic "lover" also.
Salt warning: I buy salted capers, before use them I wash them to remove the salt grains, and I leave the capers in a cup with water for 10 minutes. Anchovy are salted as well. Generally I don't add extra salt in the sauce, and I add just a small spoon in the water for pasta. Check the "Salt" situation according to your taste.
Buon Appetito!