Using a sharp knife, cut mango away from the seed. Cut as close to the seed as you can. Dice mango flesh and pull away from the seed into a glass or plastic bowl. Chop cucumber, bell pepper and onion. Add to the bowl. Mince cilantro into tiny bits and add to the bowl. Add salt and lemon juice. Use a spoon to mix all ingredients thoroughly. Marinade in refrigerator at least 1 hour before serving. Cover and refrigerate any unused portion for up to 3 days.
* if you like cilantro use 2 ozs otherwise 1 is enough to marry the flavors of the fruits