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.
Thanks for such a great, informative website in regards to canning! We homeschool and I am teaching our kids a unit on canning. I’d done plenty of canning before but had always been scared/intimidated to modify recipes in the LEAST because I didn’t understand the science behind the process. Thanks to your website I’m starting to understand a lot more!!! This is especially helpful to be able to explain things to my science-minded “why” kid who wants to know EVERYTHING! I can’t wait to try more of these recipes!
Do take a look at this post about how to choose hot peppers, when making your decision, but if you are just starting out, we would recommend starting with jalapenos. Jalapenos will give your salsa a flavor similar to a lot of store-bought brands, and they can be anywhere from mild to spicy, depending on how much veining appears on the individual pepper.
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.