More of a construction job than a recipe...
Fry some sliced red onions in a knob of butter and a healthy drizzle of balsamic vinegar until meltingly soft. It should take at least 15-20 minutes on a low-ish heat.
Pre-heat a griddle pan until very hot. Season a lamb steak on both sides before placing on the hot griddle. Cook for 2-3 minutes each side if you like your meat cooked medium.
In the meantime, toast a thick slice of bread or ciabatta. When the lamb and onions are ready you can assemble the sandwich... first sliced tomatoes (which should be at room temperature), then mayonnaise which has been mixed with a smidge of dijon mustard, then the lamb, then the slow cooked onions. Finally finish with a handful of rocket dressed with more balsamic. Top with a final piece of toasted bread if you like.
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