DD will spend HOURS picking bits of cooked spinach out of anything, but I use my fine grater and grate zucchini into ground meat for meatloaf, spagh. sauce, or burgers. It pretty much disappears after cooking and keeps things very moist. (also stretches your meat, for us who are CHEAPSKATES)
i have a great simple recipe for mini meatloaves with just ground beef or turkey, an egg, seasoned breadcrumbs, and grated zucchini - bake in a cupcake tin, perfect little portions and always gobbled up.