Preheat oven to 350 degrees. Line a rimmed baking pan with parchment paper.
Combine all meatloaf ingredients - 1 pound ground beef, 1 pound ground pork, a packet of Lipton Onion Soup Mix, 2 large eggs, 1 cup of breadcrumbs, ¾ cup of milk, ⅓ cup ketchup, 2 tbsp Worcestershire sauce, ½ cup chopped yellow onions, and 1 tsp of ground black pepper - in a large bowl. Using clean hands mix well to combine. (Don't overmix!)
Shape the meatloaf mixture into a loaf shape and add to the prepared baking pan.
Bake the Lipton Onion Soup meatloaf in the oven for 45 minutes.
While the meatloaf is baking, make the meatloaf sauce. In a small bowl, add all the ingredients for the sauce - ¾ cup ketchup, 1 ½ tsps white vinegar, 1 tsp Worcestershire sauce, 2 ½ tsps brown sugar, 1 tsp garlic powder, ½ tsp onion powder, ¼ tsp ground black pepper - and stir well with a spoon. At the 45-minute mark, remove the meatloaf and spread the sauce over the meatloaf.
Return the meatloaf to the oven and bake for an additional 15-20 minutes, or until the internal temperature is 160 degrees F. Tent the cooked meatloaf with aluminum foil and let it rest for 10 minutes before cutting it into individual slices and serving.
