I used the suggestion to use about half the cooking liquid maybe less. It turned out as expected for me. I used a variety of very ripe homegrown tomatoes and homegrown serrano chiles. Flavor was great. I used a Vitamix to completely blend everything so skins and seeds disappeared. The Vitamix lets steam escape so no issue in blending hot ingredients.
I tried this tonight. I made your recipe as written and then added several cups of peaches to the mix. My jalapenos were super spicy so I decided to add a bit of sugar (probably half a cup) to bring out a bit more of the sweetness of the peaches. It was very tasty! My understanding is that all these additions are safe since peaches are adding extra acid and the sugar is just for flavor since there is already plenty of vinegar.
This is a great salsa for beginners in Mexican cuisine. There are other salsas that are a little bit more complicated, and which require that you char the tomatoes and other veggies first. This salsa roja recipe, however, just requires that you blend the raw vegetables together, and then cook them with a bit of olive oil before adding onions and cilantro.
I just made this wonderful salsa a couple of days ago with roma tomatoes. I 4X the recipe and ended up with 32 pints of salsa. We liked it so very much I am thinking of doing more with the 1 1/2 bushels of regular tomatoes that I have. Do you think that the regular tomatoes would have too much liquid in them or would the draining take care of that problem? I didn’t add the paste last time so I would probably add it for sure to make it thicker.