Mix all the ingredients from the 'Meat ingredients' together and leave to rest in the fridge for at least 2 hours.
Then split the composition in 3 parts and form the burger patties. I used a burger press for this :)
Preheat a frying pan, use 2 puffs of olive oil to coat it and fry each patty for 2 minutes on each side. In the same time, cut half of onion into rings and fry them too.
Preheat the oven at . Add the burger patties on a metal rack over a shallow baking tray and cook them in the oven for 15 minutes at 130C.
Salad preparation
Finely slice the red cabbage, the lettuce, largely grate the carrot and add them to a salad bowl.
Add the rucola, the cherry tomatoes (cut or whole), then season with the lemon juice, salt and pepper to taste.
Sauce preparation
Mix the greek yogurt with the lemon zest and the chopped mint leaves. Season with salt to taste.