Radish Gratins Recipe

Ingredients

• 1 pound radishes with tops
• 2 ¾ teaspoons kosher salt, divided
• 2 tablespoons unsalted butter
• 2 tablespoons all-purpose flour
• 1 ½ cups half-and-half
• 1 ½ teaspoons fresh thyme leaves, divided
• ¼ teaspoon ground black pepper
• 1 cup freshly grated Gruyère cheese
• ½ cup freshly grated Parmesan cheese
• 1 cup panko (Japanese bread crumbs)
• 2 tablespoons unsalted butter, melted