Put the garlic, ginger and the 2 tablespoons of water into a food processor or blender and blend until you have a paste. Set aside.
Cut the potatoes into 1cm/½ inch thick slices. Now cut the slices lengthways into 1cm/½ inch wide chips. Heat the oil in a large, preferably non-stick frying pan over a medium-high flame. When hot, put in the potatoes. Turn and fry