Jarred black truffles

I have been re- gifted with 2 jars of black truffles. They are way past their wear date [ 4 years ] and I am wondering if I should try to use them or ditch them.
I've never had jarred truffles in any condition so I just don't know what to do. I have been dithering.....Any evidence based recommendations ????

[Jenise]

Four years? Hmmm...that gets interesting. I've used jarred truffles, and they can be quite good. In fact, they're wonderful for those of us who can't get fresh. Great for a risotto, say, or potato gratin. I would think if they pass the visual and smell test, they'd be fine to cook with but I wouldn't use them unheated. Visual: the jars usually have about a half teaspoon or so of liquid in them. Not a lot, just enough to maintain a moist environment. You'd want the liquid to still be there, and the truffle to be shiny and black all over. If it passes that test, then remove the lid and smell. If you like what you smell, it's probably fine.

They pass the two visual tests. I'll move to the aroma test when I have a definite plan for use along with a plan B if they fail

[Jenise]

Good plan. Or, just spring for a jar another jar, around here they run about $15--or not, but at least that way you wouldn't need a plan B. AND you'd have a well-stocked pantry.

So glad to see this thread. Someone gave me a jar of them as well and wasn't sure how they'd be. I think I will add them to our new years starch, whatever it ends up being. A gratin actually sounds perfect since we're doing a whole beef tenderloin and several whole salmon fillets.