Zoodles: turn zucchini into zoodles using a spiralizer. Place the spiralized zucchini in a colander. Toss with salt until coated. Place the colander in a bigger bowl for 30 minutes while zoodles dry. Pat dry with paper towel and let sit.
Bolognese Sauce: add olive oil to a medium hot skillet. Add onion, garlic, carrot and fry on low heat for 5 minutes. Add beef and season it with salt and stir frequently. when meat has browned, add tomato sauce, tomato paste, bay leaf, salt, oregano to taste. Let simmer on low heat for at least 30 minutes. Remove the bay leaf.
Heat a second skillet and add olive oil to it. Then add chopped garlic and cook for 2 minutes. Add the zoodles and cook for another 2-3 minutes.
Pour bolognese sauce over the zoodles and toss carefully. Top the dish with grated parmesan cheese before serving.