How to Make It
Light a grill. In a food processor, pulse the baguette, parsley, basil, capers, garlic, anchovies and vinegar until coarsely chopped. With the machine on, gradually add the olive oil.
Season the steak with salt and pepper. Grill over high heat until medium-rare, 8 minutes; transfer to a carving board. Slice across the grain and serve with the salsa.