Heat olive oil over medium heat.
Sauté diced carrots and onion until soft, about 2-3 minutes.
Add canned whole peeled tomatoes and whole garlic cloves to the pot and simmer over medium-low heat.
You can blend the whole peeled tomatoes before adding them into the pot. Or you can smash the peeled tomatoes with a fork once tender before adding in the stuffed zucchini.
Meanwhile, prepare the stuffed zucchini.
Remove the tops and bottoms from the zucchini and cut in half or into 3rds depending on the size.
Remove the center of the zucchini while keeping the exterior fully intact.
Salt the inside of the zucchini and set aside on a paper towel.
Prepare the filling.
If using keto breadcrumbs, soak in water or heavy cream and set aside.
Combine ground beef, mortadella, prosciutto, Pecorino Romano cheese, egg, parsley, and nutmeg to a blender or food processor and pulse until combined.
Stuff the zucchini with the filling.
Once all of the zucchini is stuffed, place the zucchini in the pot with the tomato sauce and simmer for 1 hour until tender and cooked through.
Tip: If you have leftover filling, make meatballs and simmer in the sauce with the zucchini!
Enjoy!