Place beef in a stockpot and cover with water; bring to a boil. Remove from the heat and drain.
Pour vegetable oil into a slow cooker; add beef, 8 cups water, broth, green onions, soy sauce, rice wine, brown sugar, garlic, chile peppers, chile paste, ginger, star anise, and five-spice powder. Cover and cook on Low for 8 to 9 hours.
Transfer beef to a bowl with a slotted spoon. Strain broth into a bowl; discard solids. Return broth to the slow cooker; keep on Warm until needed.
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