Tom yum (Thai: ต้มยำ, IPA: [tôm ɲɑm, tôm jɑm], tom yam in the Royal Thai General System of Transcription) is a name for two similar soups originating from Laos and Thailand, respectively. The Royal Lao version includes a pinch of rice in the soup, whereas other typical Lao and Thai versions do not include rice as an ingredient. Tom yum is widely served in neighboring countries such as Malaysia, Singapore, and Indonesia, and has been popularized around the world.
Tom yum is characterized by its distinct hot and sour flavors, with fragrant herbs generously used. The basic broth is made of stock and fresh ingredients such as lemon grass, kaffir lime leaves, galangal, lime juice, fish sauce and crushed chili peppers.
Tom yum is usually made with prawns (tom yum goong), chicken (tom yum gai), fish (tom yum pa in Lao and tom yum pla in Thai), or mixed seafood (tom yum talay or tom yum po taek) and mushrooms - usually straw mushrooms or oyster mushrooms. The soup is often topped with generous sprinkling of fresh chopped coriander (cilantro) leaves.
The less popular, and relatively more modern, variety of tom yum is tom yum nam khon (Thai: ต้มยำน้ำข้น), where milk is added to the broth. This adaptation is not to be confused with tom kha - where the galanga flavor dominates the soup and coconut milk rather than milk is used. Tom yum nam khon is almost always made with prawns, whereas chicken is often used in tom kha (called tom kha gai, "Chicken galanga soup"). Its other cousin is less well-known outside Thailand - tom klong. Sometimes Thai chili jam (Nam phrik phao, Thai: น้ำพริกเผา) is added: this gives the soup a bright orange colour and makes the chili flavor more pronounced.
Commercial tom yum paste is made by crushing all the herb ingredients and stir-frying in oil. Seasoning and other preservative ingredients are then added. The paste is bottled or packaged, and sold around the world. Tom yum flavored with the paste may have different characteristics to that made with fresh herb ingredients.
http://en.wikipedia.org/wiki/Tom_yum
http://images.google.co.th/images?hl=th&q=tom%20yum%20kung&um=1&ie=UTF-8&sa=N&tab=wiIngredients : Tom Yum Kung
Shelled prawns 2 lbs.
Clear broth 3 cups
Lemon grass, cut 1 inch pieces, lightly pounded 1 stalk
Kaffir lime leaves, torn 3
Coriander roots 3
Tomatoes (small) 5
Canned mushrooms 1/2 cup
Fish sauce 4 tablespoons
Lime juice 4 tablespoons
Coriander leaves 1 tablespoon
Toasted chili paste, fried 2 tablespoons
Small chilies, lightly pounded 5
Method : Tom Yum Kung
Boil the clear broth and add the chopped lemon grass, kaffir lime leaves and coriander roots. Cover the pot until it begins to boil. Add the tomatoes, mushroom and fish sauce and leave to cook. Add he prawns, wait for the broth to boil, remove the pot from the heat. Put chili paste and lime juice into a bowl, spoon stir until mixed well, then add he small chilies. Pour the Tom Yum soup into the bowl and stir gently until well blended. At this point, if required add additional spices to taste. Sprinkle the coriander leaves and serve while hot.http://www.thaicuisine.com/recipes/recipe1.html 
http://images.google.co.th/images?hl=th&q=tom%20yum%20kung&um=1&ie=UTF-8&sa=N&tab=wiThai Cuisine : Recipes [TOM YUM KUNG]Pour the Tom Yum soup into the bowl and stir gently until well blended. At this point, if required add additional spices to taste. ...
www.thaicuisine.com/recipes/recipe1.html
Tom yum - Wikipedia, the free encyclopediaTom yum is usually made with prawns (tom yum goong), chicken (tom yum gai), fish (tom yum pa in Lao and tom yum pla in Thai), or mixed seafood (tom yum ...
en.wikipedia.org/wiki/Tom_yum
Tom Yum Goong Recipe -- ThaiTable.comThai recipe for Tom Yum Goong. How it's really made in Thailand. Step-by-step photos. All the secrets revealed.
www.thaitable.com/Thai/recipes/Tom_Yum_Goong.htm
Thai Food - Tom Yum Kung19 Feb 2006 ... Probably one of the most famous Thai dishes around the world is the one called tom yum kung. In English, it is sometimes called Hot and Sour ...
www.enjoythaifood.com/tomyumkung.php
ต้มยำกุ้ง Tom Yum Kung ทำอาหาร สูตรอาหาร สูตรทำอาหาร อาหาร สูตร ...29 มี.ค. 2009 ... Tom Yum Kung ต้มยำกุ้ง. เกร็ดน่ารู้ "ต้มยำ" ... เป็นชื่อแกงที่นิยมซดน้ำ นิยมเสิร์ฟร้อนๆ ซึ่งจะมีอยู่ 2 แบบ คือ "ต้มยำน้ำเปล่า" และ ...
www.thiswomen.com/Food/Tom-Yum-Kung-id3296.aspx
||||| Tom yum Kung Restaurant,Khaosan Road,Bangkok,Thailand |||||Tom Yum Kung is known for excellent Thai dishes.and it?s extreamly fresh quality food makes this a top choice for Thai cuisine. Tom Yum Kung also has ...
www.tomyumkungkhaosan.com/
Mr. Chawasorn Deechaiya - Talent No.1 - thai cooking(TOM YUM KUNG)Tom yum kung is a well known dish. It has a delicate flavor, so when you season the soup, add the lime juice last and a little at a time, tasting the soup ...
learners.in.th/blog/pungkung007/81984
Thaicuisineonline.com - Tom Yum KungTom Yum Kung is a spicy Thai cuisine, soured by juice, salted by fish sauce, and heated with hot spicy chilies. This Thai dish is also a savory complement ...
www.thaicuisineonline.com/tomyumkung.html
Tom Yam KungTom yam kung, or spicy shrimp soup, is the number one of the top ten Thai dishes loved by foreigners, according to a recent investigation. ...
www.thaiwaysmagazine.com/...tom...kung/tom_yam_kung.html
http://www.google.co.th/search?hl=th&source=hp&q=tom+yum+kung&meta=&aq=0&aqi=g10&aql=&oq=tom+yu&gs_rfai=&cad=h
