I ate at the Chabaa Thai at 420 Geary (by Mason), a convenient downtown location. It's a small hole-in-the-wall restaurant and one you might normally pass right by. If you're looking for atmosphere, this isn't the place. You pass the kitchen as you go in and there are only about 8 tables in a rather spartan environment. The food, however, is top notch and very reasonable. I had Chicken Cashew, which was delicious and served with a rather huge portion of yummy rice. They serve wine and beer. The price of the wine surprised me a bit ($7). The price wasn't on the menu and while that's not that expensive, it did seem out of line given the price of the food and the beer (more in the $4 range). We were there around 4:30 p.m. so there was no problem getting a table.
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