As a disclaimer, you shouldn’t just buy a heat gun and blast food with it. Run it for a few minutes outdoors first in order for manufacturing oils and other impurities to burn off the coils.
And furthermore, unless you buy a specialty Brûlée torch, take extreme caution when using a regular torch for this task. Tipping or inverting a conventional propane torch may cause the nozzle to expel liquid propane instead of gaseous propane. This will create a flame about 5 times larger than when the torch was upright. So start with a small flame…
I’ll let you watch the video for the answer to the question. I spoil it pretty early on.
Also, strawberry-anything ice cream is a good match for caramel-y bananas.