Grilled cheese burger

Method

1. 1

   First, caramelise the sliced onions in a pan with a little oil, sugar and salt. You may want to add some water towards the end to help them along

2. 2

   Fry the burger until cooked on both sides, smash it down as it cooks to make it thinner, top with the fried onions, set aside

3. 3

   Spread some mayonnaise on the insides of the burger bun, in a pan put both halves of the bun inner side down to toast and put a cheese slice on top of both halves (see video)

4. 4

   Top the bun with the ketchup and mustard, then the cooked patty

5. 5

   Turn one half of the bun over and place on top of the burger patty, so that its inner side is facing upwards

6. 6

   Wrap in tin foil and leave for a couple of minutes so that everything melts together