Ingredients

  • 14 cup mayonnaise
  • 2 tablespoons Dijon mustard
  • 1 12 tablespoons red wine vinegar
  • 2 tablespoons olive oil
  • 2 tablespoons prepared horseradish, drained
  • salt & freshly ground black pepper
  • 12 lb thinly sliced london broil beef (from your deli department, about 8 slices) or 12 lb roast beef (from your deli department, about 8 slices)
  • 8 slices white cheddar cheese, thinly sliced
  • 12 red onion, thinly sliced crosswise
  • 1 small bunch watercress or 1 small bunch arugula
  • 4 croissants, sliced through crosswise

Method

  • Whisk together the mayonnaise, dijon mustard, red wine vinegar, olive oil and horseradish in a small bowl.
  • Season with salt and pepper.
  • Heat a grill pan or griddle over medium heat.
  • Add 3 slices of beef in an even layer, next to each other and cook for 30 seconds per side, just to warm through.
  • For each sandwich, you need 2 slices of beef.
  • Top the slices of beef with 1 slice of the cheese, cover with a lid and let melt, about 20 seconds.
  • Remove and keep warm.
  • Continue with other beef and cheese.
  • Toast the croissant slices on the grill until lightly toasted.
  • Spread some of the mayonnaise mixture on both sides of each croissant.
  • Layer on beef and cheese, onion and watercress.
  • Place the top half of the croissant and serve.