The best way to peel tomatoes is to get a large pot of water boiling and then place the tomatoes in the boiling water for 30 seconds.  (Some suggest placing them in ice water next, but that isn’t necessary for this recipe)  When you remove the tomatoes from the boiling water their skins will start to split (you may need to assist them by piercing them with the tip of a knife) and they can then be easily peeled.
We have adapted our salsa method from Well Preserved. What is special about their method is the straining of the tomatoes before packing them. This straining and sweating of the tomatoes is the same concept for pulling the moisture out of zucchini before cooking. By pulling the moisture out of the tomatoes, you allow the fruit to keep a more crisp texture when canned.

Yes, you can change both the cumin and jalapenos – you don’t want to change the amount of tomatoes or acidity (or drastically change the peppers). I think others in the comment thread have said bottled lime juice works ok as a substitute. I can’t speak to the canning safety on that, but it’s probably fine. Glad the blanching skin method is working so well!
To make it really spicy hot, use about 15-20 Arbol peppers, 1 large beefsteak tomato or 2 roma tomatoes, 2 tomatillos (3 in case they are small). That way you will have a deep red salsa. But you can always use only tomatoes. The type of tomatoes I use depends of what it is available on the market. Year around I prefer the roma tomatoes and the big beefsteak type during the summer months when they are really flavorful and juice.
Hi Heather – from all the reading I did on that recipe, the lady who created the recipe, Annie, developed it and had it tested at her local extension office years ago. There are a lot of threads on the Garden web forum – I looked for a few minutes and couldn’t find the original thread I had read but here’s a couple that might help (there’s LOTS of discussion on there about the proper way to make the salsa without messing up the pH levels and making it unsafe):
I’m so glad you found this useful in using up your bounty (plus, lucky contractors!). I’m the opposite this year – the tomatoes didn’t like being eaten by the deer and then didn’t like being covered the whole season to protect them. 🙂 I keep looking at my few pounds of paste tomatoes and can’t decide what I want to make with them – this salsa, Addictive Chutney, or the freezer marinara it’s so nice to have on hand. Choices, choices. 😉
So I started paying attention. I tried when I got home a few days later and failed. So then, I had her to my house. I wasn’t going to screw it up this time; I took notes. For over a year now, I have been making my variation of Yesenia’s recipe. And now my dear readers, I am sharing with you. Oh and Yesenia did give me permission. She is not one of those that likes to keep good food a secret!
Combine all ingredients except cumin, oregano, and cilantro in a large pot and bring to a boil, stirring frequently, then reduce heat and simmer for 10 minutes. Add spices and simmer for another 20 minutes, stirring occasionally. Ladle hot salsa into pint jars, leaving 1/2-inch headspace. Adjust lids and process in a boiling-water canner for 15 minutes at 0–1,000 feet elevation, 20 minutes at 1,001–6,000 feet, and 25 minutes above 6,000 feet.
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