Hearty Sides: Three-Cheese Cauliflower Gratin

Ingredients

• kosher salt
• 4 bay leaves
• 1 1/2 teaspoons whole black peppercorns
• 1 head cauliflower
• 4 tablespoons unsalted butter
• 1 tablespoon Dijon mustard
• 3 tablespoons all-purpose flour
• 1 cup whole milk
• 1 cup heavy cream
• 2 cups shredded mixed cheeses (provolone, smoked cheddar and/or medium cheddar)
• freshly ground black pepper
• smoked sea salt