Pulse 1 stick softened butter in a food processor with 1/3 cup chopped chives, 3 tablespoons horseradish, 1 teaspoon salt and 1/2 teaspoon lemon zest until smooth. Scrape the butter onto plastic wrap or parchment, wrap and shape into a log. Chill until firm. Slice and serve over grilled steak.
TIP: Try making other flavored butters with odds and ends from your fridge: capers, pickles, olives or even hot sauce.