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Well Beijing Beef is basically beef with onion, garlic and bell peppers what makes it special is the sauce so mostly the sauces here have all the ingredients but the Hoisin sauce. Like @Wox and Company it is Beef with green peppers or the beef with Oyster sauce. Or even @Peking Restaurant also with oyster sauce - you can always but Hoisin sauce at the supermarket and mix it or make it yourself :)
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