Cauliflower Gratin

Ingredients (for 6 servings)

• 1 large — cauliflower
• 2 tbsp — unsalted butter
• 2 whole — garlic cloves
• 2 tbsp — all-purpose flour
• 1½ cup — milk
• 1 cup — gruyere cheese
• ⅛ tsp — ground nutmeg
• ¾ tsp — sea salt
• ⅓ cup — panko breadcrumbs
• ¼ cup — parmesan cheese