I think my favourite American dish has to be Eggs Benedict. There's just something about its simplicity: the runny poached eggs, the buttery Hollandaise sauce, and the crisp bacon or ham, contrasting with the soft English muffins.
There are various theories as to how it was invented; one being that the legendary Oscar Tschirky (of Waldorf Salad fame) put it on his hotel breakfast menu after Lemuel Benedict, a retired Wall Street stockbroker, came up with the idea as a cure for his hangover in 1894. This may or may not be the case.
Anyway, I've had various versions of it over the years, including Eggs Benedict with scallops; but if you want to make the original and genuine dish- this is how you do it. First, you need to make a classic Hollandaise Sauce:
Melt 8oz (225g) of butter in a pan. Meanwhile liquidize two egg yolks, the juice of one lemon, and freshly ground black pepper. When the butter is hot, turn the liquidizer onto full, and slowly pour in the butter. Next, poach some large eggs in salted water. Toast the English Muffins, and spread them with butter. Put some slices of ham, or Canadian Bacon on top of the muffins, and top with the poached egg. Pour over the Hollandaise sauce and serve immediately.