The decor is old-fashioned, with photos of 19th century Siena on the wooden walls and old farming and kitchen implements haphazardly hung on them. The table settings and cutlery are very simple, what you'd find in a simple home. There are tables outside on the narrow paved stree but we chose to sit inside, hoping it'd be cooler, however with the door constantly opening and closing the air conditioning is fighting a losing battle.
The menu offers a number of local special dishes involving wild boar, tripe and of course the famous Fiorentina T-bone steak. My son had pici (a kind of rough spaghetti-like local pasta) in a wild boar sauce and he nearly licked the plate clean.
We both had a fillet steak as we were told L'Osteria had a reputation for them and we were right. Although the (rather gruff at first) waiter seemed skeptical about my request for very rare meat, it did come perfectly cooked and the sauces (green pepper for me, tarragon for my son) were perfect.
My husband very much enjoyed his tagliatelle in truffle sauce - again, the waiter had seemed put out that he wanted it as a main course, but it did arrive at the right time with our steaks.
The house wine is very decent and prices are reasonable for what could easily be a toursit trap given its location - while we were there, a group of Japanese girls, a Russian family and two English couples came in - there was only one Italian table yet everyone was welcomed in the same casual but friendly manner.
We wanted to go again for lunch the next day but they're closed on Sundays - another time, as my son really wants to try the tripe!
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