The minute we arrived in El Salvador Blancs started asking for Green Mango (mango verde). She called this "the taste of the tropics". Although the supermarket was sold out, we did manage to buy it from a street vendor when waiting for the traffic lights to change. It cost $1 for a bag of about 10... seemed like a bargin at the time*.
The preparation is very simple, peel and slice the mango. Season it with Limón. In a nice twist of confusion, it turns out that in Central America, limón means LIME, not lemon. It is only here that you will find the limes of sufficient acidity to make really good mango verde, ceviche etc.
Add a pinch of salt and alguashte. There is little information as to what alguashte really is. Opinion seems to fall between the seed of pepitoria and achiote. I managed to find a site that offers what is considered to be the true answer. The missionaries of El Salvador (you´ve got to trust them!) say that alguashte is slang (caliche) for ground pumpkin seeds.
* today in El Mercado Central of San Salvador we bought 5 manos (hands) of mango verde for $0.35. In 2001, El Salvador exported $0.3M (160,000kg) to the world... that´s a lot of hands.