To make the dip: Heat the sunflower oil in a saucepan then add the diced mango, white wine, cardomom pods, white wine vinegar and balsamic vinegar; cook for about 4 minutes then add ginger and garlic and continue to cook until the mango is soft enough to mash lightly.
Remove from heat; when cool remove cardomom pods then add the sour cream, diced chilli and cilantro; mix well together and set aside while you prepare the plantains.
Chips: peel the plantains and cut into diagonally slanted slices.
Pour sunflower oil to a depth of 1 1/2 inches into a large pan and place over a medium heat until hot; fry the plantain chips (in batches) for about 3 minutes, turning them until brown.
Drain the chips on kitchen paper, keeping cooked chips warm while the next batch is cooking.