Return pan to high heat with 30g butter. Cook mushrooms, stirring, for 4-5 minutes until golden. Add paprika, tomato paste and flour, and cook for 1 minute, then add consommé and brandy. Cook for 7-8 minutes until slightly thickened. Return the meatballs to pan and stir through sour cream and remaining 1 tbs mustard. Cook, for 5 minutes or until warmed through.