Steak-Panini Rolls

Preparation of onion conserve:

• Peel onions, cut in half and then into thin rings.
• Heat oil in a small frying pan and cook the onion until it becomes almost transparent.
• Add sugar, salt and red wine vinegar, lower the heat, cover the pan with a lid and simmer according to the consistency for about 15 minutes.
• Season the conserve with pepper and use it while hot to garnish the sandwich.
• If put in screw-top glass containers while still hot, the conserve will keep for about 12 months.

Preparing the bread:

• Bake the Panini Rolls following instructions on the package for about 10 minutes in the oven at about 200° C.
• Season the steak with salt and pepper.
• Heat the butter in a pan and brown the steak over a high heat on each side for about 2-3 minutes, or according to desired doneness.
• In the meantime, cut the warm bread lengthwise and spread both halves with mayonnaise.
• Spread the bottom half with onion conserve.
• Thinly slice the steak and fill the Panini Rolls. Finally put the two halves of bread together.