牙签牛肉 (yá qiān niú ròu), Toothpick Beef.
24 hour marinated beef slices in soy sauce, oyster sauce, Shaoxing wing with garlic, cumin and chilli flakes, then threaded onto toothpicks. Quick fried and finished with white sesame seeds. Usually eaten as a snack or as a 'tapa' in bars, they are available cooked from some supermarkets but I make my own to get control of the chilli level and the cook on the meat. I find the supermarket ones under-spiced and over-cooked. I go for a medium rare, which only takes seconds. Threading the toothpicks takes makes longer.