Melt the chocolate in a double boiler. Then take it off the stove and stir in the butter. Put the eggs and sugar in a bowl and beat until a white foam forms. Add the melted chocolate, then stir in the flour. Divide the mixture into four individual, well-greased molds.
Bake in a preheated oven at 200 ° C top / bottom heat (convection: 180 ° C) for about 10 minutes so that the dessert is firm on the outside but still liquid on the inside.
Serve while hot with a scoop of vanilla ice cream at a time.
Tip: Also tastes very tasty as muffins: Pour the mixture into muffin molds and bake everything at the same temperature for about 20 minutes so that the inside is no longer liquid.