Honeycomb is a natural product made by honeybees to store honey and pollen or house their larvae. It consists of a series of hexagonal cells constructed from beeswax which generally contain raw honey.
Raw honey differs from commercial honey because it's not pasteurized or filtered. You can eat the whole honeycomb, including the honey and waxy cells surrounding it. In addition, the waxy cells can be chewed as arum.
While you can eat it as-is, it makes for an excellent spread for warm bread or English muffins. Honeycomb may also be used as a sweetener in homemade desserts - or on top of pancakes, oatmeal, or yogurt.
Some people may likewise enjoy a piece of honeycomb atop a salad or alongside fruit, Peanut Butter, or cheeses.
You're likely to find honeycomb at your local health food store or farmers market, though you can also buy it online (Sedra Honey Store, for example).
A key factor in its uniqueness is that pollinating bees make their beehives with no human interference. Further, Yemen is a country with variant terrains that provide chances for quality honey.