Next-level steak & onion sandwich

• Vegetarian

• Produce

  • 2 Onions, large
  • 1 handful Watercress

• Condiments

  • 1 English mustard optional

• Pasta & Grains

  • 400 g Flank skirt steak or bavette

• Baking & Spices

  • 70 g Brown sugar, dark

• Oils & Vinegars

  • 1 Olive oil
  • 1 Olive oil, Extra Virgin
  • 125 ml Red wine vinegar

• Bread & Baked Goods

  • 1 Ciabatta loaf

• Dairy

  • 20 g Butter, unsalted

Found on jamieoliver.com