For the Rump Steak:
Generously season the meat with salt and pepper on both sides.
Heat a frying pan on high heat. Place the fat side onto the hot pan and allow the fat to render. Optionally, if the rump has very little fat, add a splash of cooking oil to the pan.
Cook the meat for 4-5 minutes on each side.
Place on a chopping board and rest the meat for 10 minutes before slicing.
For the Garlic Chive Mayo:
In a small bowl, combine the mayonnaise, garlic, chives, rice wine vinegar, salt and pepper to taste.
To Serve:
To assemble, add a generous layer of garlic chive mayo to the toasted bread, follow with rocket, tomato slices, the sliced steak and pickled red onion to enjoy!