Instead of traditional breadcrumbs, we use ground flaxseeds as the binder for this easy meatloaf. The flavors are kept straightforward—just onion, a little garlic, ketchup, and a little nutty hit from the flaxseed. Feel free to toss in some chopped parsley, oregano, or basil for more depth. We call for organic ketchup because it is usually sweetened with sugar, not high fructose corn syrup; some organic brands are also lower in sodium than standard ketchup.