This article is adapted from the April 9, 2022, edition of Gastro Obscura’s Favorite Things newsletter. You can sign up here. We have written about thousands of intriguing foods and drinks over Gastro Obscura’s history—everything from a soup steamed with volcanic rocks to a cocktail containing a human toe. But nothing has intrigued me, made me desperately desire a taste, and driven me to distraction like peanut butter fruit. That’s not its official name. Bunchosia armeniaca, to go by its scientific classification, is known by several monikers in South America,…