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Thailand may boast the finest street food on earth; it has long attracted migrants from across Asia, so its street cuisine, both at vendor carts and in tiny restaurants, blends many styles of cooking. Here's a slide show that was in The New York Times recently that describes dining out Thai style.
The Thai lifestyle and eating habits lend themselves to street meals. Since Thais normally eat many small meals rather than three squares and traditionally prefer to meet outside the house, street food suits them. Most Thai dishes can be cooked relatively quickly, and Thais are fastidious about cleanliness, important to customers worried about eating alongside a road. It never ceases to amaze me that foreigners travel half-way around the world to get here - and then eat in western style restaurants with western-style prices rather than enjoying fresh and inexpensive delicious Thai food cooked to your specifications right in front of you!
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How hard it is to escape from places. However carefully one goes they hold you — you leave bits of yourself fluttering on the fences — little rags and shreds of your very life. — Katherine Mansfield