How to Make It
On a work surface, sprinkle the minced garlic with salt and, using the flat side of a knife, mash the garlic to a smooth paste. In a small bowl, whisk the garlic paste with the rosemary, paprika and olive oil. Rub the marinade all over the steak and let stand at room temperature for 2 hours or refrigerate for up to 2 days.
Heat a grill pan. Season the flank steak with salt and pepper and grill over moderately high heat, turning once, until medium-rare, about 7 minutes. Transfer the steak to a board and let rest for 5 minutes. Thinly slice the steak across the grain.
Grill the bread until crisp and golden, about 2 minutes per side. Spread each slice with 1/2 teaspoon each of the mayonnaise and mustard. Arrange the steak on the bread and top with the pickled green tomatoes.
In a medium bowl, toss the arugula with the tomato pickling liquid and season with salt and pepper. Mound the arugula on the sandwiches and serve.
One Serving 290 cal, 14 gm fat, 4 gm sat fat, 13 gm carb, 2 gm fiber, 28 gm protein.