Join the queue early for the best eating experience in town (my personal favourite anywhere!). You'll be served an aperitif and some cheese whilst still in the queue.
Once inside, sit down at communal tables and ask for the fixed price menu(veggies a la carte), and enjoy a massive traditional Tuscan feast. This is a family business, with food from the family's own farm.
They're very friendly, especially when I explained the purpose of the trip (ie to eat in his restaurant!), which secured yet more wine. It appears a little lavish, but with super-cheap airfares from the UK, why not?