We usually buy items in bulk at Cash 'n Carry or Costco. That includes things like mustard and mayonnaise.
A couple months ago I had bought a couple of large jugs of mustard at Costco and opened one of them, which of course is now in the fridge. My husband, not realizing I'd already opened a jug, opened the second...which must now be refrigerated as well. With the milk I'm getting from our cow, fridge space is at a premium and I had these two big jugs taking up room.
So I decided to try canning mustard. What the heck, it never hurts to try, right?
I poured all the mustard into a pot and heated it up.
I spooned it into squat pint jars...
I put them in two layers in a boil-bath canner for 20 minutes.
As far as I can see, they turned out fine.
I labeled and dated them and stored them away (I left one pint uncanned in the fridge for immediate use). When it comes time to opened one of the canned jars of mustard, and assuming it tastes okay, I'll buy up several gallons of mustard and re-can them. I like having condiments canned up in small jars.