Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer). Oil the pop-over tray, preheat in the oven.
For the filling select raspberries. For the dough melt butter, let cool a little. Mix eggs, milk and 1⁄2 TL salt with a whisk briefly. Stir in butter. Add flour at once and stir in quickly until the dough is just lump-free.
Then fill the dough into a container with a pouring spout (e.g. measuring cup).
Remove hot sheet from the oven. Immediately fill each tray to 1⁄3 with dough. Spread the berries on top. Pour the rest of the dough on top. Bake immediately in the hot oven for about 15 minutes. Then reduce the temperature (electric oven: 175 °C/circulating air: 150 °C/gas: see
manufacturer). Continue baking for 10-12 minutes. Dust with icing sugar and serve warm.