Chicken in Pumpkin Seed Sauce

The pipián sauces of Mexico are among the oldest continuously prepared dishes in the Americas. When Hernán Cortés arrived in Tenochtitlan in 1519, the Aztec nobility were already dining on fowl in complex seed-thickened sauces that would take the Spanish another century to even begin to understand. These weren't the fiery chile bombs that would later come to define "Mexican food" in the Anglo imagination. They were nuanced, velvety, built on the bitter-sweet foundation of pepitas—pumpkin seeds—toasted until fragrant and ground to powder. This particular version adds the indigenous tomatillo, which provides a tartness that balances the rich seeds, and just enough habanero heat to remind you that pre-Columbian cooks knew exactly what they were doing. The pistachios are a modern addition, bringing additional complexity and a subtle green color that nods to the more elaborate pipianes of Oaxaca. The technique is straightforward but rewards patience: toast the seeds slowly until they're genuinely aromatic, blend the vegetables until they're silky-smooth, and don't rush the final whisking. The sauce should coat the chicken like velvet, which is precisely what the Aztec nobility had in mind five hundred years ago.