Hanger Steak - Fire Magic Grills

Ingredients

• 2 tablespoons unsalted butter
• 2 shallots, peeled and finely chopped
• 1 cup heavy cream
• 3 tablespoons grainy Meaux-style mustard or Dijon mustard
• 2 teaspoons coarsely ground green peppercorns
• Coarse sea salt
• 2 pounds hanger steak
• 1/3 cup Dijon mustard, or more as needed
• Coarse salt and freshly ground black pepper
• 2 tablespoons minced fresh chives (optional)