Open-Face Steak Sandwich with Parmesan Dressing

• Meat

  • 1 1/2 lbs Flank steak

• Produce

  • 6 cups Mature arugula leaves with, stems tender
  • 1/2 Red onion, small

• Condiments

  • 3 tbsp Lemon juice, fresh
  • 1/4 cup Mustard, whole grain

• Baking & Spices

  • 1 Kosher salt

• Oils & Vinegars

  • 1/2 cup Olive oil
  • 1 tbsp Vegetable oil

• Bread & Baked Goods

  • 1 Ciabatta loaf

• Dairy

  • 1 1/2 oz Parmesan

Found on bonappetit.com

Ingredients

• 1½ pounds flank steak
• Kosher salt, freshly ground pepper
• 1 tablespoon vegetable oil
• ½ small red onion, thinly sliced
• ¼ cup whole grain mustard
• 3 tablespoons fresh lemon juice
• ½ cup olive oil, plus more for bread
• 1½ ounces Parmesan, finely grated
• 1 ciabatta loaf, halved lengthwise
• 6 cups mature arugula leaves with tender stems