You're gonna need some real cold water. Either ice water or refrigerated, or really any drink that's super cold and chilled. Drink that first, slosh all that cold liquid in your mouth, and then take a piece of whatever you're eating and put it in your mouth while it's still cold inside. Preferably a small piece, just to be safe; this is still kinda risky to do.
Let me know how this works out for you if you give it a try.
I used to bake bagels, and I had a reservoir of cold water in front of the oven so I could constantly dip my hands in to mitigate the heat. Even with that, my fingertips were pretty smoothed out. I could never get those produce bags at the grocery store open.