I think your question might be a little misleading or i’m reading it wrong. I’ve done sous vide for several years. You do not sous vide “in” butter. You may add butter to the bag to be sous vided. I pre fere no added butter to the bag. Hope this helps
Thanks, we have one unused and about a third used. No sickness but will be returning. Also did a search and signed up for immediate notification to anty recalls for Michigan (my state). I think everyone should signup for notifications if their state has them. Thanks again