kladdkaka: sticky chocolate cake

sticky chocolate cake (kladdkaka)
slightly adapted from fika by anna brones and johanna kindvall
note that this recipe halves beautifully

1/2 c. (71 g., 2.5 oz) hazelnuts, if possible roasted and rubbed in a tea towel until their skins come off*
1/2 c. (113 g., 4 oz) butter
2 eggs
1 c. (198 g., 7 oz) sugar
1/3 c. + 1 tbsp. (28 g., 1 oz) unsweetened cocoa powder
1/4 tsp. salt
3 – 4 tsp. poppy seeds (optional)

Preheat the oven to 350 degrees Fahrenheit (175 Celsius). Grease a 9-inch (23-centimetre) springform pan.

Put the nuts in a food processor and grind until almost fine.

Melt the butter. Set aside to cool.

Whisk the eggs and sugar together in a bowl. Stir in the cocoa powder and salt. Then add the almonds, then the slightly-cooled butter. Stir until smooth.

Pour into the prepared pan. Sprinkle the top evenly with poppy seeds. Bake 15 to 20 minutes, until it's set on top but still a bit sticky inside. To check this, carefully lift one side of the pan. It's done if it doesn't move. If it still looks runny, let it bake a little longer.

Cool before serving – either alone or with a dollop of whipped cream.

*The original recipe calls for unroasted almonds. I think walnuts would be good too.