A huge covered food market, open Monday-Saturday 7am-2pm, also Saturday 4pm-8pm.
More fabulous Italian food than you can poke a stick at - and infinitely better priced than those “Tuscan specialty” shops pitched at tourists. If you plan to drag home your own body weight in formaggi, porcini, salsicce, lenticche and vino then this is the place for you. Also a few sit-down places for a super-cheap lunch - mind the pigeons though.
Updates
There's a stall around the side of the market that sells hot beef sandwiches that I still dream about.
Is this your business?