Beef Sandwiches with Mushrooms and Pickled Cabbage

Ingredients

• Pickled Cabbage

  • 4 cups (340 g) green cabbage, thinly sliced on a mandoline
  • 1 tsp salt
  • 1 carrot, grated
  • 2 tbsp (30 ml) apple cider vinegar
  • 1 tbsp fresh dill, finely chopped

• Sandwiches

  • 1 lb (450 g) beef top sirloin steak, about ¾ inch (2 cm) thick
  • 2 tbsp (30 ml) olive oil
  • ½ lb (225 g) white mushrooms, sliced
  • 1 tbsp (15 ml) whole-grain mustard, plus more for serving
  • 1 tsp steak spice
  • ½ cup (125 ml) chicken broth
  • 4 submarine buns, each 10 inches (25 cm) long, warmed
  • 3 oz (85 g) sharp cheddar cheese, grated