Authentic Chicken Fajita Marinade

boneless-skinless chicken breasts ((24 oz/ 680 g))

medium onion, sliced into 1/4 inch rounds ((6 oz/ 170 g))

roughly chopped fresh cilantro

lemon juice ((2 oz/ 56 ml))

oil of choice ((2 oz/ 56 ml))

water ((2 oz/ 56 ml))

salt

pepper

medium red bell pepper, cut into strips ((6 oz / 170 g))

medium green bell pepper, cut into strips ((6 oz / 170g))

sliced onion reserved from the marinade*** ((see note))

olive oil (15 ml)