Barbecued steak with tomato and anchovy butter

This is not so much a recipe but a list of flavoured butters to enhance that eternal summer favourite, barbecued steak. I love the tomato and anchovy butter because it incorporates rich and smoky flavours with fresh parsley, but the tarragon and horseradish butter is a classic, and the wild mushroom option is perfect for a late-summer or autumn barbecue. The butters can be made in advance, rolled in baking paper and chilled until ready to use.