Possible Clues:

• Arbiter of tasty Welsh dish of cheese on toast
• British dish with an American version called a Hot Brown
• Melted brie, smothered in salt, served up as cheesy meal
• Dish that's unusual and something of a bore
• Welsh dish with melted cheese
• Dish, exquisite taste
• Cheese sauce on toast
• Snack unusually good mouthful
• Cheesy pub fare
• Arbiter slammed Welsh dish