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Annette's is a classic American diner as is Cafe Des Cascadeurs

If you want quick counter service try Cowboy Cookout in Frontierland.

For steak, also in Frontierland try Silver Spur Steakhouse. In Disney Village there's also The Steakhouse

Click each of the above links, they link to the menus so you can have a look! You can find all of them and a great DLP dining guide here