This definitely isn't a mild salsa. However, the heat comes from a few small chiles, all of which are required for the flavor. The chile tepins in particular are very small, but they round out the flavor in a subtle but wonderful way so I don't advise leaving them out. (To cut the heat a bit, you can try removing some of the seeds in the chipotles, but it's messy business with the canned peppers in adobo...) I think a touch of cilantro might be a perfect addition; I'll try it next time and update with the results. Either way: this salsa is SOOO addicting!