I opted for ramekins. (8 cm diameter) Butter the mold. Then flour it. Pour the excess into another buttered mould. This recipe is for 4 ramekins! Place it in the refrigerator. Choose 145 g of quality chocolate. In my case, I mix 120 g of dark chocolate and 25 g of chocolate caramel. 3 choices are available to you according to the desired flavor… Choice n°1: Nature (butter) Add 110 g of butter to the chocolate. Melt in the microwave for 1 minute 800W Mix until a homogeneous mixture is obtained. Choice n°2: Hazelnut (brown butter) In a saucepan, melt over medium heat… 140 g of butter. Make a brown butter. The cooking of brown butter is done by hearing and not by looking at it!!!!! The butter must crackle like this… listen up! When he stops crackling, he’s ready! Filter it out. You should get 110 g of brown butter. When it is lowered to 45°C…. Melt in the microwave for 1 minute 800W Add the 110 g of brown butter…. making sure it is between 40 and 45°C. Mix until you obtain a fluid device. Choice n°3: Coconut (coconut oil + butter) Add 75 g of coconut oil to the chocolate and… 35 g of butter. Melt in the microwave for 1 minute 800W Mix…. In a bowl, pour… 3 large eggs…. 40 g brown sugar and… 20 g powdered sugar. Beat the eggs with the sugar. Add 50 gr of flour. Stir until smooth. Then add the chocolate and butter mixture. Mix it up. Add 2 pinches of fleur de sel. The device must be homogeneous. I strongly advise you to weigh your preparation! Pour everything into a piping bag. This should give you 500 g of dough. You can make 4 ramekins of 125 g each. Your preparation should be rather fluid. If this one is a little less fluid… The cooking time should be reduced from 1 to 2 minutes. Bake (rotating heat) for 10 minutes at 210°C 5-10 minutes after leaving the oven…. The flowing core must come off the wall. Unmold it only from that moment on! It takes off on its own! It is possible to freeze your melting chocolate hearts. It will then only need to be defrosted for 3-4 hours in the refrigerator…. and spend it for 30 seconds in the microwave at maximum power.