Place the chicken breasts in a dish.
Add sliced onions and a stalk of celery cut into sticks.
Pour in the juice of 2 lemons.
Let marinate for 2 hours.
Remove the celery and drain the chicken and onions.
Cut the remaining 2 lemons into slices.
Cook the chicken breasts for 4 to 5 minutes on each side.
Halfway through cooking, cook the onion slices and lemon slices, turning them 1 to 2 times.
Serve the chicken breasts topped with golden brown onion slices and lemon slices.