Free delivery with a purchase of €50 in Belgium, the Netherlands and Luxembourg
Preheat the oven to 180 °C.
Mix the mayonnaise with the lemon zest, mustard and chives.
Peel the onions and cut into rings. Fry for a few minutes in the pan with some olive oil.
Add the honey and herbs and stir well, letting the rings caramelize nicely over a medium heat. Remove from heat and put to one side.
Fry the burgers and season with salt and pepper.
In the meantime heat the buns for a few minutes in the oven.
Remove them, cut in half lengthways and spread with lemon mayonnaise. Place the burger on top with some caramelized onions, a slice of cheddar and some lettuce.
Serve, if you wish, with a salad.