Clean, wash and cut the rhubarb into small pieces. Roughly chop the chocolate coating. Melt butter and chocolate coating in a small pot at low heat and pour into a mixing bowl. Whisk the eggs. Add sugar, salt, whisked eggs, flour and baking powder and mix with the whisk of the hand mixer to a smooth dough.
Fold in smacks and rhubarb. Spread evenly on a greased deep fat pan of the oven. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 40 minutes. Remove and let cool. Melt 75 g chocolate. Use a peeler to remove small rolls from the remaining chocolate. Cut the cake into triangles. First sprinkle with melted chocolate in lines. Sprinkle with chocolate rolls and some smacks.
Melt 75 g chocolate. Use a peeler to remove small rolls from the remaining chocolate. Cut the cake into triangles. First sprinkle with melted chocolate in lines. Sprinkle with chocolate rolls and some smacks. Cut the rhubarb into fine strips and decorate the blondies with them