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Prepare the balls with the different ingredients. Set the thermostat to 130°C in Sauté mode. Fry the balls with half the oil and set aside. Sauté the onions. Add the garlic and tomatoes and sauté 2 to 3 minutes.
Set the thermostat to 100°C in Braise mode. Add the liquids and cook covered for 20 minutes. Season with salt and pepper.
Add the balls and cook covered again in Braise mode for 15 minutes. Serve hot.