Overgrown Zucchini? I grew up in the UK and I can assure you that Zucchini are just immature vegetable Marrows. Cut it into rings and scoop out the mushy centres, stuff the rings with a mix of minced lamb or beef mixed with grated onions, an egg and herbs to your taste.
Drizzle with bacon fat of fat of your choice and sprinkle with salt and pepper , and even sprinkle with grated cheese if you are into cheese on this diet, otherwise some bacons ribbons.
Bake for half an hour in a hot oven.
The bigger the marrow the more juicy and luscious it will be. Surprised you kiwis aren't into marrows, being often more of the UK tradition than us Aussies.