Heat the oil to approx. 175 °C. Peel bananas and cut or slice them into thin slices. Fry banana slices in portions for about 3 minutes. Drain fat well on kitchen paper.
For the dip, roast the grated coconut in a pan without fat for approx. 5 minutes, turning, remove. Peel and finely grate the ginger. Mix sour cream, ginger, lime juice and grated coconut. Season to taste with salt.
Season banana chips with chilli powder and salt. Arrange dip and chips.