Line a baking sheet with parchment paper and set it aside for now.
Cut the stem off of a zucchini and cut it in half the long way. Scoop out the seeds, hollowing it out into a boat shape. Try to make sure the zucchini is at least 1/2 inch thick all the way around to prevent tearing. Repeat this with all of the zucchini.
Sprinkle the insides of the zucchini with 1/2 teaspoon of the sea salt. Place them cut side down on the lined baking sheet. Bake for 15-20 minutes, or until they are tender.
Meanwhile, sauté the onion in the coconut oil until it just begins to soften. Add the ground beef, remaining 1/2 teaspoon of salt, and the black pepper. Cook these together, breaking up the meat with your cooking utensil. Cook until the beef is browned and cooked through.
Add the remaining ingredients, stir. Bring everything to a boil, reduce the heat, cover, and simmer for 10 minutes.
Take the zucchini from the oven, turn them over, and spoon the meat mixture into the center.
Enjoy!
Notes
For non-paleo family members, feel free to sprinkle some shredded cheese on top.