Preheat oven to 400�F. Grease 1-quart casserole. Melt butter in medium saucepan. Stir in flour and dill; gradually stir in evaporated milk, water and bouillon. Cook over medium heat, stirring constantly, until mixture is thickened. Stir in pasta, tuna, peas and pimiento. Spoon into prepared casserole; sprinkle with chips. Bake for 8 to 10 minutes or until chips are golden brown; season with salt and ground black pepper.