At the juice bars that line the beach, the most popular choice is açaí. It is the purple fruit of an Amazonian palm, and is served as a frozen slush mixed with banana, guaraná and – often – granola. The taste is unusual, like a chocolate-blueberry sorbet with a mildly medicinal aftertaste. Its high levels of antioxidants make it a "superfood" and it also gives you energy and (apparently) sex drive.
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