Easy Flank Steak Sandwich with Potato Bread | Heinen's Grocery Store

Ingredients

• 2 lbs. Heinen's organic flank steak
• 1/4 cup Heinen's olive oil
• 2 Tbsp. Heinen's apple cider vinegar
• 2 Tbsp. soy sauce
• 2 Tbsp. Worcestershire sauce
• 2 Tbsp. Heinen’s organic stone ground mustard, plus more for serving
• 1 tsp. Heinen's garlic powder
• 1/2 tsp. salt
• 1/2 tsp. black pepper
• 2 Tbsp. Heinen's butter
• 1 loaf potato bread
• 2 cups Heinen's arugula
• Fresh basil, for serving