As others said, sides. Most meatloaf recipes also include onions and other veggies in the loaf itself which is why there's a thread of comments here pointing out how this recipe as garbage. This is just a giant dry hamburger. Meatloaf also commonly has milk soaked breadcrumbs to pad the meat out so you don't need as much of the expensive stuff.

Ya normally have some sides with like mashed potatoes and green beans.

If you haven't had good meat loaf, you're really missing out.

Maybe they just forgot to include the bread crumbs?