Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 12-15 minutes. Sprinkle a kitchen towel with sugar and turn the sponge cake plate over, remove baking paper. Cover the sponge with a second damp cloth and let it cool down.
Prepare rice in boiling salted water according to package instructions. Wash and clean spring onions, dab dry and cut into rings. Wash thyme, shake dry and cut into coarse pieces. Remove meat from the pan and set aside. Sauté the garlic, spring onions and thyme in the frying fat, deglaze with stock and sherry. Add butter, put the meat back in and let it braise slightly for about 5 minutes, season again with salt and pepper. Add rice.