Meanwhile heat oil in a large sauce pan then and in garlic and onion. Saute' for around 2 minutes.
Add in mushroom and carrots. Let the mixture simmer until the mushroom turn dark brown in color or become soft.
Add in tomato sauce, sugar and salt.
Let it simmer for around 5 minutes. Serve on top of the Zoodle with the meatballs. (don't cook the zoodles. Just put the sauce on top while it is hot and it will soften the zoodles. This really refrigerate well and you can just heat it up in the microwave.
Serve and Enjoy.