I really like the taste of a fresh Serrano so I tried to keep this sauce on the basic side. I didn't want to use anything that would overpower the taste of the Serranos. I like apple cider vinegar but thought this would alter the taste so I just went with a half cup of plain white vinegar. I used all the Serranos from my last harvest, 1.5 to 2 kilos at a guess (I don't have kitchen scales), with 2 cloves of garlic and some s/p to taste as it was cooking. There's a hell of a lot of seeds in the Serranos so I ended up putting it through a strainer before bottling. Even with just half a cup of vinegar it still came through strong so I might rethink this next time.