Preheat your oven to 350°F (175°C).

Grease your 9-inch round cake pan with butter and line the bottom with parchment paper.

In a double boiler or microwave, melt the chopped chocolate and butter together until smooth.

In a mixing bowl, whisk together the sugar and eggs until well combined.

Pour the melted chocolate mixture into the egg and sugar mixture, stirring gently to combine.

Gently fold in the flour and salt until just combined.

Pour the batter into the prepared pan and smooth the top.

Bake for 25 minutes or until the edges are set but the center remains slightly soft.

Let the torte cool in the pan for about 10 minutes, then invert onto a plate.