Chocolate Buckwheat Cake

Ingredients

• 7 tablespoons (100 grams or 3 1/2 ounces) unsalted butter, plus extra for buttering pan
• 3 1/2 ounces (100 grams) bittersweet dark chocolate (70 to 72 percent is ideal)
• 4 large eggs at room temperature
• 1/2 cup (100 grams or 3 1/2 ounces) granulated or blond cane sugar
• a good pinch of sea salt
• 1 teaspoon pure vanilla extract
• 1/4 cup (35 grams or 1 1/4 ounces) buckwheat flour
• 1/4 cup (30 grams or 1 ounce) almond meal
• confectioners’ sugar, lightly whipped cream and/or berries to serve (optional)