Cut the mango to remove the stone. Scoop out the fresh and cut into small cubes or just roughly chop.
Do the same with the avocado.
Cut the onion and tomatoes (scoop out the seeds first) into the same size as the mango and avocado pieces.
Finely slice the chili.
Place everything in a mixing bowl. Season with salt and pepper. Pour in the lime juice. Toss.
Roughly chop the mint leaves and cilantro. Stir into the salsa.
Taste. Add more salt, pepper or lime juice, or all of them, depending on your preferred balance of flavors.
Serve the salsa with tortilla chips, or spoon over grilled meat or fish, or use as a sandwich topping. Whichever way you decide to use this wonderful salsa, it will add a delightful freshness to your meal.