I took a walk this morning down to Khlong Toei market, a large and busy wet market not far from my hostel in Lumpini. Though mostly offering raw meat and veg there are plenty of food stalls dotted around too for fruit and cooked meals.
Being a local market I saw one group of westerners in a couple of hours there. That did mean the stall owners didn't speak English, but I managed to get some Durian fruit and a couple of drinks for breakfast without any hassle. I really do need to learn some basic Thai though!