Cut the onions in half, pour them in a casserole with boiling water and leave them a few 3 minutes or until tender; remove them and drain them. In a frying pan with oil, chill the onions with the sugar over medium heat until tender and golden.
Preheat oven. Rub the steaks with garlic, sprinkle rosemary on top and put in the oven. Leave them a few 5 minutes at high temperature, turning them around often, until golden on the outside and pink on the inside. Let them rest some 3 minutes and cut them into slices diagonally.
Cut the muffins in half and, If you want to, butter them. Cover the base with lamb slices, cheese, the onion, mint and, At last, the muffin. You can serve the burgers with salad and decorated with fine herbs to your liking
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