Add half of the unsalted butter and the meatballs. Close the bowl and select STEW P7. Adjust the cooking time of Step 1 to 10 minutes (instead of 5 minutes). Press Start to activate the program.
Close the bowl. Adjust the cooking time of Step 2 to 10 minutes (instead of 30 minutes). Press Start to activate Step 2. After that pour in the white wine and the cream. Season with a good pinch of pepper and salt.
Close the bowl and press Start to activate Step 3. Let the meatballs and celery braise in the cream sauce. In the end press cancel to exit the keep warm mode. Check the seasoning of the celery cream sauce and add extra pepper or salt to taste if necessary.