Combine the tomatoes, onion, peppers, vinegar, sugar, lime juice, jalapenos, garlic, and salt in a large, non-reactive pot. Bring to a boil and simmer for 10 minutes. When that time has elapsed, stir in the chopped cilantro.
Taste and add additional jalapeno, lime juice or salt should it need additional balance.
Ladle hot salsa into prepared jars, leaving 1/2 inch headspace. Wipe the rims, apply lids and rings and process in a hot water bath for 15 minutes.
You'll see from our pictures that we doubled this recipe during the class, and we also used 8oz. jars, so that everyone could take home a jar.