Make sure you make reservations at Mustard's as it is a popular spot for Napa Valley dining (visitors and locals alike). My perfect meal here includes the onion rings with tomato-apple ketchup (they are thin sliced), the crabcake and the "Famous Mongolian Pork Chop with housemade mustard sauce". I am not sure if the Mongolians make their pork chop this way, but it is fantastic and the mustard sauce is delectable.
The menu has cute writing, such as the Truckstop that always has meat, rarely vegetables and the dessert "Sometimes Crisp, Cobbler or Deep Dish Pie, always a la mode". The food is great, the service is attentive and the bill won't completely blast your wallet. This is Cindy Pawlcyn's first restaurant and one of her best.