Season, then cook the rump steak on the sear grate to your desired doneness.
While the steak is cooking, place the onions face down on the barbecue until dark and charred.
Boil the sugar and vinegar in a saucepan on the side burner.
Place the onions into the sugar and vinegar and simmer for 5 minutes to carmelise.
For the chimichurri: mix the coriander, parsley, shallots, and chili, add olive oil and Maldon salt in a bowl and set aside.
Check the steak with the Weber Connect probe and remove from the barbecue when it's at your desired internal temperature.
Coat the steak on both sides with the chimichurri sauce and rest for 10 minutes.
Carve the steak and season well. Place the caramelised onions around and serve.
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