In the base of the MicroPro® Grill, add onions and sprinkle ¼ tsp. of the salt. Place cover on top of onions in the grilling position. Microwave on high power 4 minutes. Remove from microwave and transfer to a medium bowl.
Grill the steak, toss and serve
Meanwhile in a second medium bowl, stir together steak cubes, cornstarch, remaining salt, pepper, onion powder and coriander until steak is well coated.
In the base of the MicroPro® Grill, place steak cubes in an even layer. Place cover on top of steak in the grilling position. Microwave 3 minutes or until steak is medium to medium-rare and caramelized. Transfer steak to bowl with onions, toss to combine. Serve warm.