Antinori.
20 mins drive away, but can you put a time cost on rolling hills, cantina tours, wine sampling + glorious sups? Via Cassia per Siena, 133 / Bargino / 055 23 595 / lunch only / antinori.it
For more lunch options, see Verrazzano (Wine Bars), saladicious Moyo (Bars) and panini Mariano (Shopping/Centro Storico).