Compound Butter - Softened butter mixed with whatever herbs you fancy is easy to make and a great way to add flavor to most anything, including a sizzling steak. It makes sense to have some on hand at all times. Roll it up like a log in some plastic wrap and freeze it. Then slice off a pat and put it atop your steak the second it comes off the grill.
Chimichurri - A steak staple in Argentina, where people know a thing or two about a good piece of meat. This bright and spicy condiment adds a garlicky kick to the blandest of cuts.