Acai is a small, dark purple berry that grows on palm trees in the Amazon rainforest, especially in Brazil. It’s commonly called a “superfood” because it contains antioxidants, fiber, and healthy fats, but in its natural state it’s quite different from the sweet fruits most people are used to. The taste of acaí is similar to a mix of unsweetened cocoa and dark berries, with a subtle richness that comes from its natural fats.