The Indian Cook House's buffet in Irvine (off Culver) is actually one of the better buffets I've seen for Indian food. It's a little bit americanized (not very spicy) but still very good and for 5 bucks for an all you can eat lunch buffet you can't go wrong. They have a decent selection which even has desserts. The carrot stuff they have for desert (I forget the name) is awesome. Make sure you go before noon unless you want to wait for a table. The one drawback is that the place isn't very big.