It's a new restaurant on the main road at Klong Prao beach, 20m on the left past Tropicana entrance. Pumpkin serve excellent traditional dishes and vegetarian. Run by Leng who also takes care of the Blue Lagoon Thai cooking classes.
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More bad news: Leng who was running the Blue lagoon Thai cooking classes is not working there anymore! The rest of the staff is still there and can organise cooking classes for you but they hardly speak English. So may be a perfect way to improve your Thai language skills!