Heat a large frying pan or wok over high heat until a bead of water sizzles and instantly evaporates upon contact. Add the cooking oil and swirl to coat. Add the beef and immediately spread the beef out all over the surface of the wok or pan in a single layer (preferably not touching). Let the beef fry undisturbed for 1 minute. Flip the beef slices over, add the garlic to the pan and fry for an additional 30 seconds to 1 minute until no longer pink, Pour in the sauce, add the blanched broccoli and bring to a boil. Pour in the dissolved cornstarch and cook, stirring, until the sauce boils and thickens, 30 seconds.
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