I hope that in Book 4, Bolin wanders into some random Fire Nation beach cafe where a tattooed man and his amputee wife make a peaceful living selling awesome drinks, making baked goods in their fancy earthen oven, and cool storytelling sessions and puppet shows. One day, the lady made a new flatbread and the man used the searing heat of his custom oven to create a miraculous invention- pizza. Thus the beginning of a culinary revolution that transcended all political and socioeconomic borders.
Sorry I went with earth nation garb instead. I figured they would prefer to feed the chaos in Ba Sing Se.
edit: THEY ORIGINALLY NAMED IT P’ZA AFTER THEIR DEAR LOST FRIENDS