In a small bowl, beat the butter with the garlic, lemon zest, herbs until fully combined. Set aside for a few minutes.
in a bowl, combine the turkey mince with the egg, milk and seasoning.
Shape four equal patties about 4-5cm diameter.
Press the centre of each patty and add a spoon of garlic butter.
Wrap the mince around and shape to a usual flat patty with a small indentation in the centre. Toss a little of flour around to help set later.
The butter will help keep the burger moist while grilling but down pierce it or else the butter will run away and flame the BBQ or griddle pan.
Place the shaped burgers in the fridge covered to rest at least 15 minutes.
Preheat a griddle pan or barbecue to medium heat. When hot, oil the grill grates and place the burgers onto the grill. Cook for 4-6 minutes on each side or until it reaches 70˚C covered, if possible, with a lid to help the burger cook quicker, turning once.
Add the cheese over the burgers and place a lid over to allow the cheese to melt over the burger.
Toast the bun and add some mayonnaise and a few leaves of salad. Add the cooked burger with the cheese and top with your favourite topping such as tomato slices, pickles cucumber, … enjoy immediately.