Parmesan Steak Flatbread with Watercress

Ingredients

• • 1 ½ lbs. flank steak
• • Kosher salt and freshly cracked black pepper.
• • 1 tablespoon vegetable oil
• • 3 cloves garlic, finely chopped
• • ¼ cup finely grated pecorino cheese
• • ¼ cup finely grated parmesan cheese
• • ½ cup olive oil
• • 1 whole lemon, juiced
• • ½ teaspoon red pepper flakes
• • Kosher salt and freshly cracked black pepper
• • 1 lb. pizza dough
• • ½ red onion, thinly sliced
• • 6 cups watercress