Grease a springform pan with a tube bottom insert (26 cm Ø) and dust with flour. Chop the chocolate coating. Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Mix 300 g butter, sugar and 1 pinch of salt with the whisks of the mixer for 2-3 minutes until creamy.
Stir in the eggs one by one. Mix 400 g flour and baking powder. Alternately stir in with the coconut milk.
Cut the dough in half. Stir coconut flakes into one half, cocoa and 50 g chopped chocolate coating into the other half. First fill the light, then the dark dough into the mould. Using a fork, pull both doughs through spirally to create the marble pattern and smooth them down.
Bake in a hot oven for 45-55 minutes. Leave to cool in the mould for about 20 minutes. Then turn out of the tin and let it cool down completely.
For the glaze, melt 150 g couverture and coconut oil in a hot water bath, let it cool down for about 10 minutes. Cover the cake with the icing, let the icing set.