Finely chop the candied pineapple. Beat butter, sugar and salt until creamy. Stir in the eggs one by one. Mix flour and baking powder. Alternately stir in with the coconut milk. Mix 2/3 dough and candied pineapple. Mix 1/3 dough, grated coconut, cocoa and coffee.
Pour the dark and light dough alternately into a greased, breadcrumbed box form (30 cm long; 2 litres capacity). Pull through with a fork. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 1 hour. Take out, let cool down a little. Remove from the mould and let cool completely. Serve decorated with coconut slicer and candied pineapple