A fine roulade with tangerines - it has won all my guests appreciation

A fine roulade with tangerines - it has won all my guests appreciation Ingredients: for the cake top: eggs - 4 pieces flour - 70 g ( oz) cocoa - 20 g (0.7 oz) sugar - 120 g ( oz) baking powder - 5 g ( oz) Tray size 32 X 32 cm (12.6 x 12.6 in) IN THE OVEN 180 °C (356 °F)/15 minutes for the meringue layer: egg whites - 4 pieces sugar - 150 g (5.3 oz) coconut flakes - 120 g ( oz) IN THE OVEN 180 °C (356 °F)/15 minutes