Step 1

Use an electric beater to beat the butter in a bowl for 3-4 minutes or until pale and creamy. Add the garlic, anchovy, mustard and capers. Beat until combined. Stir in the chives and parsley. Season with salt and pepper.

Step 2

Spoon the butter mixture along the centre of a piece of foil to form a log. Roll up and twist ends to secure. Place in the fridge for 1 hour or until firm.

Step 3

Preheat a barbecue grill or chargrill on high. Season steaks with salt and pepper. Spray with oil. Cook for 3-4 minutes each side for medium-rare or until cooked to your liking. Transfer to a serving platter. Slice butter. Divide among steaks. Cover with foil and set aside for 2 minutes to rest.