The unaged, 100% Blue Weber agave tequila that made Espolòn's name — the house's first expression, and still the one that does the most work behind a bar. It's built for mixing without being a throwaway: clear, bright, light-to-medium in body, with enough peppery agave bite to survive lime and salt, and enough sweetness to drink neat over ice if that's your mood. The distillery, Casa San Nicolás, sits in Los Altos de Jalisco, where founder and Maestro Tequilero Cirilo Oropeza built it in the mid-'90s and where they still blend two still types — a pot still for earthier character, a column still for a lighter, fruitier one. Two charming details worth knowing: the house plays classical music to the fermenting yeast, an Oropeza practice born of his belief that sound waves help activate it, and the spent agave fiber is composted into fertilizer, some of it handed to local farmers. Even the label earns its keep — drawn in the woodcut style of the 19th-century Mexican printmaker José Guadalupe Posada, starring Ramón the rooster (espolòn means rooster's spur, a point of Mexican pride). Margarita season doesn't end, and this is a genuinely well-made bottle to meet it with.