How do I get the burnt aroma off burnt food?
Well, if the aroma is truly in the food then there's not much you can do. However, you can take steps to make sure that the aroma is subdued as much as possible. It's quite possible that a large portion of the burnt aroma is merely in the air.


Turn exhaust fans on to get the aroma out of your kitchen asap
Submerge the burnt surface in water as soon as possible to prevent the aroma from spreading
Be very careful "separating" the unburnt from the burnt
Inhale something very strongly scented. Why? It's quite likely that a significant portion of the burnt smell is merely stuck in your nose. If you can somehow nullify that source of the burning aroma, you can perhaps more accurately gauge if the food itself actually has it.
Possibly you could overpower it by adding something very fragrant to your dish that fits. If your dish would work with lemon or lime this could help. If it's a desert maybe cinnamon or cloves might be useful.


The best thing though is prevention. Use lower heat when possible if you find yourself being regularly careless. Using a better pot/pan may help also depending on what you are currently using. Also, don't turn down help if your guests offer. Make them stir! :D

P.S. Don't inhale something dangerous like bleach or ammonia.