Agua de Limón con Chía

Ciudad de México, Valle de México, is where this version lives: in the glass vitroleros of La Merced, Mercado de Jamaica, and the fondas that put one cold jarra at the center of a cheap outdoor meal. It is not a cocktail, not a health-store invention, and not a beach-resort lemonade. It is market water with memory.

The defining ingredient is the chia. Not as decoration. As structure. The seed must bloom in plain water first, until each one carries its little clear skin and floats through the drink. The women behind the aguas frescas counter know this without measuring. They stir, they wait, they stir again. That is the technique.

Use limón criollo if you can find it, the small green lime with a sharp perfume. In the capital, the limones may have come from Colima or Michoacán, and the chia may have come from Jalisco or Puebla, because Ciudad de México has always cooked from what the mercado carries in from every direction. Esto no es comida de un solo México. This is a 32-state cuisine, even when the drink is sitting in one jarra.

There is no chile here, and that is correct. Not every Mexican table needs heat to prove itself. My mother kept chia in a reused glass jar and wrote one instruction in the margin of her notebook: stir twice before serving. She was right. Saber cocinar es saber vivir.