No. Let your son add extra flavors after he opens the jar. Some fresh cilantro or green onions or a sprinkle of cumin does wonders for a less than stellar batch. Yeah, I've had those, too, when the tomatoes weren't quite as good tasting or I used different peppers.

Agree. Trying to reprocess this long after often carries unnecessary safety risks plus a very real decline in quality due to the double processing. Do as malna suggested - adjust as needed after opening the jar to serve.

If you feel they simply must be fixed now then the guidelines would recommend freezing them, not re-canning.

Dave