If you mince the chocolate and butter and set them aside, this will save you time. Combine the flour and cocoa powder, sift once, then set aside.
Put the chocolate and butter in a bowl and melt by immersing in a hot water bath. Once melted, add the sugar and beat with a whisk. Add the eggs, heavy cream, and rum while continually mixing.
Add the flour and cocoa powder and continue to mix. Once you're finished mixing, pour into a pan covered with parchment paper, and bake at 180℃ for 30 to 35 minutes.
If you can poke a toothpick through the cake without any batter sticking on, it's complete. Let the flavors settle overnight, then store in the refrigerator in a sealed container or wrapping.
Story Behind this Recipe
The ingredients and preparation are simple, but it's got a distinct chocolate taste. I like a strong and sweet gateau au chocolat. This one is very simple.
Be careful not to put any water in. Wipe any moisture completely from your utensils with tissue paper (cutting the chocolate on a wet chopping board will lead to failure). Just mix with a whisk, it's very simple. No need to whisk the eggs.