You should ask icebreaker questions about food because food is a factor we all share and have a unique relationship with, and thus is an easy way to get to know coworkers. Whether you ask about the meal teammates grew up eating as a kid or favorite midnight snacks, you will understand who colleagues are as a people through these questions. The subject is also something we interact with everyday, much like your co-workers, so you can learn more about their preferences, allergies, and who on the team is the best baker. You may even inspire a coworker to bring fresh-baked cookies or world-famous homemade chili into the office, or to share a favorite brownie recipe!