Ingredients

• 4 cups (about 8 ounces) broccoli florets
  
• ¹/₄ cup olive oil
  
• ¹/₂ teaspoon salt
  
• ¹/₄ teaspoon black pepper
  
• 2 tablespoons Dijon mustard
  
• 1 shallot, minced
  
• 2 tablespoons apple cider vinegar
  
• 1 teaspoon maple syrup
  
• 4 pretzel buns
  
• 4 ounces cheddar
  
• 1 avocado (1/4 per sandwich), sliced
  
• 4 small handfuls of mustard greens