Mini Yorkshire puddings with roast beef and horseradish cream

Name: Mini Yorkshire puddings with roast beef and horseradish cream
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: British
Ingredients: 1 egg; 85g/3oz plain flour; 85ml/3fl oz milk and water mixed; vegetable oil; 1 tub crème fraîche; 2 tbsp fresh horseradish; salt and pepper; 2-3 beef fillets (depending on size); flat leaf parsley, to garnish