How to Make It
Light a grill or preheat the broiler and position a rack 8 inches from the heat. In a small bowl, combine the shallot and vinegar. Lightly rub the steak with some of the olive oil, sprinkle generously with salt and pepper and let stand for 10 minutes.
Grill or broil the steak, turning once, for 12 to 13 minutes for medium-rare meat. Transfer the steak to a cutting board and let rest for 5 minutes, then thinly slice the meat.
Brush the bread on both sides with the remaining olive oil and grill or broil until golden on both sides. Rub one side of each toast with the garlic and set 4 of the slices, garlic side up, on a work surface. Arrange the tomatoes on the toast and season with salt and pepper. Spoon the shallot vinegar over the tomatoes, and top with the arugula, steak and anchovies. Cover with the remaining toast and cut in half. Serve immediately.