**Use frozen mangoes and skip the chilling step!
For a "regular blender" follow steps 1 and 2 and puree, then transfer to a bowl and add the finely chopped mango, cucumber, onion, lime juice, and 2 cups cold water.
To chill (see above) Place bowl in a larger bowl of ice and cold water and stir until cool. Just before serving, stir in cilantro and 1 1/4 teaspoons salt.