Mix all the ingredients together in a bowl, chill in fridge, and allow the flavours to marry.
Do this at least 30 minutes to an hour before serving.
Guacamole
Mash your avocados and mix in all the other ingredients.
Set aside until you are ready to build your burger.
Burger Patties
In a bowl, mix all the ingredients together.
Shape into 4 patties, use your thumb to press a little indentation in the middle of your patty.
Then grill on each side for 3-4 minutes or until cooked through.
In your last 30 seconds, top with cheese slice and cover pan.
Assembling burger
Build your burger with generous serving of guacamole, patty, and top with mango salsa.
Serve immediately.
Notes
Try not to make your guacamole too early as your avocados will oxidise and turn brown. If you are making ahead of time, place a seed into your guacamole mix, and cover bowl tightly with cling wrap.