What Is the Difference Between Chop Suey and Chow Mein?

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The main difference between chop suey and chow mein is the style of the dish; chop suey contains meat and vegetables in a thickened sauce over rice whereas chow mein contains meat and vegetables in noodles. Chop suey is believed to have originated from Southern China in Toisan, where it was common practice to create meals from leftover ingredients. On the other hand, chow mein originated in Northern China and is based off of traditional Chinese food.