Sirloin with cafe de paris butter

Ingredients

• 250 gram softened, chopped butter
• 1/2 cup mixed fresh herbs, finely chopped
• 2 tablespoon lemon juice
• 1 egg-yolk
• 1 tablespoon finely chopped capers
• 1 finely chopped eschalot
• 2 teaspoon worcestershilie sauce
• 1 finely chopped anchovy
• 1 teaspoon curry powder
• 1 clove, finely chopped garlic
• 4 220g sirloin steaks
• 1 tablespoon olive oil
• paris mash, steamed green beans, to serve