2) Place 2 slices of the cheese on each burger, close the lid or tent with aluminium foil, and cook until the cheese has just melted, about 1 minute. Place the burgers on the buns and top with a few tablespoons of green chilli sauce, lettuce, tomato and pickled jalapeno, if desired.
For the green chilli sauce:
1) Place all ingredients in a blender and blend until smooth. Season with salt and pepper, to taste.