In a bowl, combine the beef, pork, veal, garlic, eggs, onion, parsley, almond flour, salt, baking soda, & black pepper. Use clean hands to mix until well combined. Lightly wet your hands and form the mixture into equal-size meatballs slightly larger than golf balls (around 2 ounces each).
In a large sauté pan, heat olive oil over medium-high heat. Working in batches, add the meatballs and cook until browned on two sides, 4 minutes per side. Transfer browned meatballs to a bowl and set aside. Repeat to cook the remaining meatballs.
Lower the heat to medium-low and add the olive oil and garlic. Gently heat the garlic until fragrant, about 2 minutes. Add the crushed tomato and stir through to combine. Return the meatballs, raise the heat to medium-high and bring to a simmer. Cover with a lid, lower the heat to low, and cook, stirring occasionally, for 90 minutes.
Taste the sauce for seasoning and adjust with salt and pepper as required. Serve with zoodles or cauliflower puree.