Heat oven to 340°F. Grease and line an 8" x 8" metal baking pan with parchment paper.
In a large bowl, whisk together eggs and caster sugar until light and a little frothy. Add remaining ostkaka ingredients and mix until thoroughly combined.
Pour into prepared pan. Sprinkle top with sliced almonds, then dust with ground cardamom.
Bake for 35–45 minutes or until set and golden.
Serve slices lukewarm with a hefty spoonful of Hafi Lingonberry Preserves and a dollop of whipped cream on top.
Notes
If you don’t have caster (AKA superfine) sugar, very briefly blitz granulated sugar in a spice grinder or blender. Don’t grind too much, otherwise you’ll end up with confectioners’ sugar!
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