Gassiverious foods.
Broccoli, a vegetable, and Dried apricots, a fruit, are the most "gassiverious" foods that I've ever ingested.
After a helping of broccoli, or dried apricots, it's necessary for me to carry ballast, like a hot air balloon, just to remain on the ground.
As a word of caution, I'd dissuade the use of those two foods together. It would be extremely difficult to predict the outcome. I fear it would be highly explosive.
I might add, that both of those foods, despite their "gassiveriousness", are just delicious.