Nonna is an Italian restaurant in Mexico City, Mexico, and the useful context is what kind of evening it seems built to deliver. The draw is ingredient-led cooking, comfort and a clear sense of place; at a polished mid-to-high price point, it should be judged as a polished dinner worth planning ahead for. It is most compelling for diners seeking warmth, produce and familiar pleasures handled with care, especially if the night calls for something more considered than a safe default.