Marinade the chicken in all the ingredients listed.
Add the oil to a non stick pan and add the chicken.
Cook over a medium heat for about 10 minutes.
Flip the chicken over and cook for a further 10 minutes.
Allow to rest for 5 minutes and cut into strips.
Tomato Chutney
In a small non stick pan over a medium heat, add mustard seed and once they begin to pop add the garlic and green chilli.
Allow to cook for for 1 minute and add the remaining ingredients.
Turn the heat to low, cover the pan and cook for about ten minutes or until the tomatoes have broken down completely and the sauce is thick. Check midway to ensure they aren't catching.
Pickled Onions
In a small bowl combine the ingredients for the pickled onion and set aside.
Assemble
On a plate add the mango, chicken and tomato and red onions and enjoy!