Preparation of Oven: Preheat the oven to a temperature of 180°C or 350°F. Apply a light coating of oil to a loaf tin or use a non-stick spray to prepare it for the meatloaf.
Preparation of Glaze: In a separate, small mixing bowl, combine the tomato ketchup, cider vinegar, and brown sugar. Mix until homogeneous and set aside for later use.
Meatloaf Mixture: In a large mixing bowl, introduce the panko breadcrumbs. Grate the onion over these breadcrumbs, ensuring the moisture from the onion is absorbed. Subsequently, incorporate all remaining ingredients, mixing thoroughly until well combined. The mixture should then be molded into a loaf shape, ensuring that the surface is smooth to minimize potential cracking during baking.
Transfer to Loaf Tin: Carefully relocate the prepared meat mixture into the previously prepared loaf tin. The surface should then be generously coated with approximately half of the earlier prepared glaze.
Initial Baking: Insert the loaf tin into the preheated oven and bake for a duration of 45 minutes. At this juncture, remove the loaf tin and, if noticeable, discard any accumulated excess fat. The meatloaf should then be brushed with a majority of the remaining glaze.
Secondary Baking: Return the loaf tin to the oven for an additional baking duration of 30 minutes.
Resting Period: Post baking, it's crucial to allow the meatloaf to rest for approximately 10 minutes prior to serving. This ensures optimal texture and ease of slicing.
Serving: Turn the meatloaf out and slice it into thick portions. It's ideal to accompany the meatloaf with side dishes of choice, such as mashed potatoes and steamed vegetables.