Grease a heart shape with a 1 liter capacity and heat the oven to 180 ° C.
Beat butter with sugar and rum flavoring until creamy. Stir in the eggs one at a time.
Mix flour, cocoa, baking powder and cinnamon and sieve in; stir in well. Finally, fold the chocolate chips into the dough. Pour into the greased heart shape and bake at 180 ° C for about 45 minutes. Let cool on a cake rack.
Mix the powdered sugar with the red wine to form a thick glaze and use it to completely cover the cake and let it dry.
Label with melted chocolate if you like.
The cake tastes very juicy even after several days.