You start with 2 ripe mangos, 1 head of cilantro, 1 jalepeno, and 1 red onion
i peel the skin off the mangos with an apple peeler, but you can do it with a knife too.
slice up into pieces that can fit into your blender. Along with the mangoes, add the cilantro (you can cut the individual leaves off with a pair of scissors, or you can just put the whole head in there, as I do it), the jalapeno with the stem cut off, and the peeled whole red onion.
blend it until it is all liquid. at this time, i like to test it for spiciness, and usually have to add another jalapeno, but everyone has their own taste.
put in the refrigerator to chill for a couple hours. you can then serve it with chips, or put it on your favorite Mexican food item. i personally put it on my world famous carne asada tacos, which Chadwick will be tasting tonight....maybe he'll add his opinion