Roast beef on mini Yorkshire puddings - Irish Beef

Ingredients

• 225g piece fillet of beef
• ¬? tsp mustard powder
• 1 tbsp olive oil
• 2 tbsp sunflower oil
• 100g plain flour, sifted
• 2 eggs
• 175ml milk
• 1/2 tsp English mustard
• 1 tbsp grated fresh horseradish
• 1 tsp sugar
• 1 lemon
• 75ml double cream
• sea salt and freshly ground black pepper
• fresh watercress sprigs, to garnish
• Ingredients
• Method