Grease a springform pan (24 cm Ø) and dust with flour. Preheat the oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Wash the currants, drain and remove from the panicles.
Cream 125 g butter, 200 g sugar, lemon zest and 1 pinch of salt with the whisks of the mixer. Stir in the eggs one by one. Mix 200 g flour and baking powder, alternating with poppy seeds and stir into the butter-egg-cream.
Pour the dough into the mould and smooth it down. Approx. 2⁄3 Spread currants on top. Bake the cake in a hot oven for 45-55 minutes. Allow to cool slightly, then remove from the tin and allow to cool completely.
Warm the jelly. Fold in the rest of the berries and simmer for about 2 minutes. Spread on the cake immediately and let it cool down.