TIPDon’t have a fresh onion on hand? Dice several onions in advance and freeze them in in a storage bag! The onions will already be soft from being frozen and they cook beautifully.
TIP:You can store the uncooked meatloaf in the fridge for up to 3 days. Just be sure to wrap it really well to prevent air from getting in. Or freeze it for up to 5-6 months, again sealed as well as you can.