Took a day ride to Leavenworth from Carnation and while trying to decide on lunch, happened to see the menu for the Soup Cellar and decided to check it out. I asked the person at the register if they had any gluten free items and found out they did. We ordered the grilled onion burger and the BBQ burger along with a couple of beers. The food arrived quickly, and the burgers looked delicious. My wife's burger was huge and loaded with grilled onions and she said it was one of the best burgers she's ever had. I had the BBQ burger with grilled onions and a GF bun, and it was fantastic. The fries were perfect and there were so many we couldn't finish them. Not a high-end place but comfortable and the staff was very friendly. We'll definitely eat here again!