Pictures and recipe courtesy of my parents. My comments are in italics.
Meat Stuffing (for about 15 flowers):
Mix 1 lb ground beef, ~1 teaspoon salt, ~2 teaspoons pepper, ~1 teaspoon garlic powder, 1 beaten egg.
Remove sex organs from the flowers. I disagree, I think they add flavor. Also remove the 5 little spiky green things on the outside of the flower base, but keep the green cup where the stem attaches. Again, I disagree, leave the spiky things. If there is a little zucchini at the base, that's ok. Soak and clean in cold water for 5 minutes.