The acid ingredients used in salsa help preserve it and prevent botulism poisoning. You must add acid to canned salsas because the ingredients’ natural acidity may not be high enough. Commonly used acids in home canning are vinegar and lemon juice. Lemon juice is more acidic than vinegar, but has less effect on flavor. Use only vinegar that is at least 5% acid and use only bottled lemon juice.
Hi there! This salsa looks wonderful and it might be exactly what my husband is looking for (something less “tomato-y” on his taste buds). I’m wondering though if there is a good way to make a smaller amount to test it out. Would cutting everything in half work or would that alter the taste too much? I’d appreciate any thoughts or wisdom you have to share! 🙂 
Now to the topic at hand – I’ve had the same concerns as you, especially since my dear husband is Mexican! We loved the canned salsa I made for the first week or two, then it was too vinegary, so now I use it for stuff like zucchini squash to use it up. Haven’t tried it again because, well we don’t have enough tomatoes yet and am leery about the vinegar and how to make it spicy enough. I never thought to skimp on the onions to compensate!!!
The key to this recipe is to char the tomatoes and peppers on the stovetop. I tried to do it in the oven once and roast the tomatoes & peppers, bad move. It will take you about 20 minutes, but sooooooo worth the wait. You’ll need to rotate the veggies from time to time, so all the sides are pretty even. Here is what the vegetables will look like once they are done:

As you will notice when we dive a little further into these recipes, Mexican food has a stunning range of somewhat special ingredients. From Masa Harina, the essential ingredient of corn over a wide array of chilies either fresh, dried or ground to Mexican oregano and tomatillos. Some of these may at first glance seem foreign and difficult to come by, but fear not we’ll discuss the individual ingredients as we go and they’ll be easier to come by than you think.
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