To prepare a spicy thai grilled prawns with sour mango salad recipe, first you'll need to prepare the ingredients for the salad. First, you will need the following ingredients: 12 cup chopped fresh cilantro, 2 tablespoons chopped red onion, 1 tablespoon chopped green chilies, 1/2 teaspoon each ground cumin and ground coriander, and 1 teaspoon ground paprika. Toss the chopped cilantro and onion with the lemon juice and salt and pepper to taste. Then, add the remaining ingredients to the bowl and stir to combine. Pour the dressing over the mixture and mix well. Cover and refrigerate for at least 1 hour before serving.