Preheat the oven to 180°C. Melt the dark chocolate and 110g of the butter in the microwave or in a saucepan over low heat. Stir in the cake mix and eggs and mix well. Grease 4 cup-sizeramekins well with the remaining butter. Dividing evenly, pour the chocolate mixture into the ramekins. Bake until the tops of the puddings are set, 12 to 14 minutes. Served in the ramekins or turn out onto individual dessert bowls.
