Ad Hoc, Thomas Keller's casual American, set menu dinner spot, is under construction this summer to add seats to their dining room. I don't know if they are trying to make up for the noise or if they are just trying something new, but they've opened a little lunch spot in their backyard.
Addendum is open for lunch Thurs-Sun until around October. Lunch is to-go and starts at 11 and goes until 2, or until they run out of food. Luckily, you can call and order ahead. For $16.50, you get your choice of The Famous Fried Chicken or Wagyu beef brisket, but both come with the same two sides. On opening day, it was sweet corn succotash with red peppers and fresh chickpeas, and potato salad.
No joke, really the best fried chicken I've ever had. Breading shatters when you bite in to it, and is followed by very moist meat, no doubt from the brining. You order out of the little shack, and though it's to-go, they have a pretty little garden space to eat in if you don't want to take it with you. Even though there is no official service, hosts still seemed to roam around and check on you, which I thought was nice. It is especially nice to be able to sample the fried chicken genius on a college student budget.
Highly recommended if you happen to be in Yountville for a weekend.