Preheat the air fryer to 400°F / 200°C and set the timer to 20 minutes. I like to have a little extra time on the timer whenever use the air fryer, just in case I need more time.
While the air fryer is heating, dice the steak and add it to a large bowl.
750 g sirloin steak
Season it with salt and black pepper, and toss it in the Worcestershire sauce. Mix well.
1/2 tsp salt, 1 tsp ground black pepper, 1 tsp Worcestershire sauce
When the air fryer is ready, spray the basket with oil, add the steak cubes to the air fryer basket in a single layer, and cook them for 10-12 minutes, until browned on the outside.
Oil spray
When the steak bites have finished air frying, remove the air fryer basket and place the steak onto a plate or bowl to rest for 5 minutes. Avoid tipping the air fryer basket while it's attached to the tray as the juices that have gathered in the bottom tray will also pour out.
While the steak is resting, melt butter in a pan over medium heat, add the fresh garlic, and sauté for 2-3 minutes.
2 tbsp butter, 3 cloves garlic
Sprinkle in the crushed red pepper flakes after one minute and continue cooking.
1/2 tsp red pepper flakes
To serve, toss the steak bites in the hot garlic butter (you can also dip steak pieces in the garlic butter sauce if you prefer).
Garnish with a squeeze of fresh lemon juice and sprinkle with fresh parsley.
Squeeze of fresh lemon juice, Chopped fresh parsley