Flash Mahoney

Question for the group. We recently found out that two of our grandsons have celiac. They love my spaghetti sauce. I typically make a huge batch at a time (4 gallons +/-) and store/freeze the sauce in half gallon (gluten free) Tupperware containers. The last batch I made, I chopped a couple stalks of celery and some onion on a clean cutting board that has...