The dish's colors — green chile, white walnut cream sauce, and red pomegranate seeds — happen to match the Mexican flag, which is why it's traditionally served each year around Independence Day in September.
A fresh poblano chile is roasted, peeled, and stuffed with a sweet-savory picadillo of ground meat, fruit, and spices, then draped in a chilled walnut cream sauce and scattered with pomegranate seeds. Market stalls and home cooks in Puebla make it almost exclusively in the late-summer window when walnuts and pomegranates are in season.