Glaze ‘em, smother ‘em, stuff ‘em—meatloaves really can do it all. These loaves mix things up with a spoonful of creamy sauce over top, made with sweet caramelized onion, cream cheese, butter, and a pinch of parsley. On the side, sumac—a tangy Middle Eastern spice—seasons carrots and zucchini with citrusy flavor (similar to lemon zest!). Serve it all together, letting the sauce pool around the veggies, for a perfectly paired plate and yet another meatloaf miracle.