Preheat oven to 350°F (180°C) and prepare a 9-inch (22 cm) cake pan by lining it with parchment paper.
In a bowl, whisk together the flour, salt, and baking powder.
In another bowl, cream together the butter and 100 g of sugar until light and fluffy. Add the egg yolks one at a time, then stir in the vanilla extract.
Gradually fold the dry ingredients into the butter mixture until just combined.
Pour the batter into the prepared pan and sprinkle the red currants evenly over the top.
In a clean bowl, beat the egg whites with the powdered sugar until stiff peaks form. Gently spread the meringue over the red currant-topped batter, smoothing it out evenly.
Bake the cake for 30-35 minutes, or until the meringue is golden brown and the cake is baked through.
Let the cake cool in the pan for 10 minutes, then remove it and place it on a wire rack to cool completely.
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