Heat a large wok over high heat until very hot. Add 1 teaspoon of the oil and swirl to coat the wok. Add one third of the beef and stir-fry for about 30 seconds, or until just sealed. Remove to a plate. Repeat with remaining beef in two batches.
Add remaining oil with the Broccolini® and stir-fry for 1 minute. Add 2 teaspoons of water, cover with a lid and cook for 45 seconds or until bright green. Remove the cover, add the Minicaps® and stir-fry 30 seconds.
Add the stir-fry sauce and bring to the boil, stirring often. Add the cashews and return the beef to the wok. Stir-fry until combined. Serve with rice.