Origin of Iddeley is claimed by Kannadigas, Gujarathis, Maharashtrians and Malasians.
Origin of Dosa is claimed both by Tamilians and Amdhraits. Sambar is of recent origin and is from Tamilnadu.
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References:
http://controversialhistory.blogspot.com/2008/09/origin-of-idly.html
http://en.wikipedia.org/wiki/Idli
http://en.wikipedia.org/wiki/Dosa
http://en.wikipedia.org/wiki/Sambar_%28dish%29
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