Grilled Flank Steak with Pickled Onion

Grilled Flank Steak with Pickled Onion was pinched from <a href="http://mypanera.panerabread.com/recipes/recipe/grilled-flank-steak-with-pickled-onion/" target="_blank">mypanera.panerabread.com.</a>
INGREDIENTS
1 pound flank steak
¼ cup + 2 tablespoons olive oil
Salt and freshly ground black pepper, to taste
1 medium red onion, thinly sliced
½ cup apple cider vinegar
8 slices Italian bread or 4 country rolls, split in half
½ cup mayonnaise
¼ cup prepared horseradish
2 cups arugula, lightly packed
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