Before cooking, allow the steaks to come to room temperature.
Peel and slice the onions
Firstly, make the caramelised red onions, heat the oil in a heavy-bottomed frying pan over a high heat. Add the onions, salt & pepper and let sauté over a lower heat for 15-20 minutes stirring occasionally to prevent sticking until they become soft and a golden colour.
Add the sugar and vinegar and turn the heat up to medium to dissolve the sugar and reduce the vinegar until the mixture is sticky and like a jam.
Season the steaks well with salt and pepper.
Place a frying pan with the oil on a high heat until smoking hot. Add the steaks and cook to preference (2-4 minutes per side). Slice the steak and leave to rest.
Slice the blaas in half to make a bun and add spread with mayo on both sides. Assemble the steak, caramelised onion, blue cheese and rocket. Add the bun lid on top to sandwich the filling together & serve.
Notes
The right bread can make or break a sandwich, but Waterford’s very own ‘Blaa’ bread is exceptional here served as a vessel for sliced steak & other unctuous sandwich fillings.