Meatballs with white wine mushroom sauce

Meatballs

• 80 g stale white bread
• ½ onion
• 4 sprigs fresh flat-leaf parsley, leaves only
• 1 tsp mixed herbs, dried
• 20 g olive oil
• 500 g beef rump steak, trimmed, cut into pieces (4 cm) and slightly frozen
• 1 egg
• 20 g milk
• ½ tsp fine salt
• ½ tsp freshly ground black pepper

White wine mushroom sauce

• 60 g Parmesan cheese, cut into pieces (3 cm)
• 60 g dry white wine
• 1 tbsp cornflour (starch)
• 1 garlic clove
• 1 shallot (approx. 30 g)
• 40 g butter
• 200 g button mushrooms, fresh, cut into thin slices
• 1 pinch fine salt, to taste
• 1 pinch freshly ground black pepper, to taste
• 200 g cream
• 1 sprig fresh flat-leaf parsley, leaves only, for garnishing