Steak sandwich with caramelised onions

Method

1. Mix mayonnaise and garlic together in a cup and set aside.
2. Spray a small non-stick frypan with oil and place over medium heat. Add onion and cook, stirring occasionally, for 7 minutes or until golden.
3. Add the sugar and vinegar and cook, stirring, for 2-3 minutes until onion caramelises. Season with pepper and set aside.
4. Preheat a barbecue grill or griddle pan on high heat. Spray both sides of mushrooms and steaks with oil and season with pepper. Place mushrooms on grill and cook for 3 minutes each side until cooked through; set aside.
5. Reheat grill, add steak and cook for ½ to 1 minute each side, depending on thickness and until cooked to your liking. Transfer to a plate, cover to keep warm.
6. Cut bread crossways into 4 pieces then cut each in half lengthways. Toast or grill both sides of bread then spread mayonnaise on one side of each slice.
7. Place bread open-faced in the centre of a serving plate. Top the base with steak, mushroom, gherkin and onion. To the bread top, add beetroot, tomato and rocket or spinach leaves.
8. Carefully sandwich both bread halves together and serve.