Wash and peel the mango, then give it a rough chop and discard the seed or pit.
Place the chopped mango into a pot along with the smashed garlic and the chopped scotch bonnet pepper, including the seeds for heat. Traditionally in Guyana, Wiri Wiri peppers are the pepper of choice, so if you can source them you can use about five instead.
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Add the water and roasted geera, then bring everything to a boil.
Reduce to a steady rolling boil and cook for about 25 to 35 minutes, or until the mango softens and begins to fall apart, filling the kitchen with that warm aroma of garlic and toasted geera.
Reduce the heat or take the pot off the stove for safety, then use a potato masher or stick blender to puree everything. You can control the texture of the finished Guyanese mango sour, whether you prefer it rustic or smooth.
Taste and adjust the salt if needed. As you sample it, you should feel that familiar tartness hitting the sides of your cheeks, the same kind of sharp sour taste many of us remember from childhood and our first encounter with this wicked condiment.
Finish by stirring in the fresh lime juice. I prefer lime over white vinegar (traditionall used in most Giyanese homes) because the citrus brightens the finished Guyanese mango sour and lifts the natural tang of the green mango. If the finished mango sour is ovely tart, add sugar, starting with 1/2 teaspoon.