Drain the pineapple well and cut it into small pieces. Dice ginger finely. Mix flour, grated coconut, sugar, baking soda, salt and ground ginger in a bowl. Mix yoghurt, oil and egg.
Add to the flour mixture and mix gently with a fork. Fold in pineapple and ginger. Pour the dough into a greased box form (25 cm long; 1 1/2 litres capacity). Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 50-65 minutes (test with sticks).
If necessary, cover after about 40 minutes. Leave to cool in the mould for 10 minutes, then turn the cake over onto a cake rack. Let it cool down. Dust the cake with icing sugar. Decorate with coconut chips and dried pineapple slices.