Preheat oven to 425 degrees.
Cut the ends off zucchini – just the very ends, not too much so that it will hold its “boat shape.” Scoop out center seeds and carve a boat.
Boil zucchini for 3-4 minutes depending on size and thickness, so they soften and cook about half way. Heat pan, and brown ground beef. When close to done, add onion, garlic and tomato, as well as salt. Cook for a few minutes until the tomato is cooked down and the onion and garlic get fragrant.Place zucchini halves on a roasting pan, fill with cooked ground beef mixture.Optional step is to sprinkle on cheese or dairy-free cheese (if you are casein-free).
Roast in oven for 10-15 minutes until cheese is melted and/or top is a bit browned.Makes 4 servings.