Grilled Chicken Burgers with Caramelized Onion

Very simple. Most of this dish is just assembling to be honest. And it's so good for you. It ticks all the boxes: vegetables, carbohydrates, protein, good fat (olive oil)...

You can omit the cheese and mayo if you want to make this healthier.

Ingredients
4 hamburger buns
4 tablespoons olive oil
2 onions, sliced thinly
1 tablespoon dark brown sugar
2 tablespoons balsamic vinegar
2 tablespoons water
500g chicken mince, seasoned
4 Boston lettuce leaves
4 slices of tomato
4 dill pickles, sliced
Mayonnaise, ketchup, and mustard

Procedure
Slice open the hamburger buns and toast them cut side down on a heated but not oiled grilled plate.
Remove and set aside.
Shape the seasoned chicken mince into four, not too thick (otherwise they won't cook that well on the inside while burning on the outside), patties. Grease the grill plate with half the olive oil and cook the patties until cooked through... around 15-20 minutes.
Meanwhile, heat the remaining olive oil in a pan and fry the sliced onions. Once they're cooked, add the balsamic vinegar, water, and brown sugar. Stir until onion caramelizes.
Arrange one lettuce leaf and one slice of tomato on each bottom half of hamburger bun. Top with cooked chicken patty, and pile the sliced dill pickles and caramelized onion on top. Spread mayonnaise on top half of the bun and place over the burger. Serve with mayonnaise and ketchup.