Peel and finely dice the ripe mango, avocado and red onion. Add to a bowl.
Deseed and finely dice a jalapeno. Tip: Choose a jalapeno that is smooth for a less spicy pepper, if you see marks on the pepper it will be spicier. Add to the bowl.
Chop the cilantro finely and add to the bowl.
Squeeze the lime and add kosher salt. Mix well to combine. Serve with chips or on top of fish, chicken or steak.