Sylvester's is the best burger joint in Los Osos. It is just a small place and not very impressive to look at, but the food is definitely impressive. The burgers are chargrilled and juicy. The best part of the burgers is that they have a signature sauce that they put on them and it is really good. It is not just your typical thousand island dressing, it is something really different and it is very enjoyable. They also have nice, hot, crispy fries. Their prices are really good as well.