Heat 1 tbsp olive oil in a large saute pan over high heat. Add the seafood and cook for 1 1/2 minutes. Transfer to a bowl and set aside.
In the same pan, heat 1 tbsp olive oil over medium-high heat. Add diced onions and saute for 2-3 minutes, stirring occasionally, until the onions are soft and translucent. Add minced garlic and saute for more 1 minute.
Add the tomato passata, salt, pepper, and sugar, stir to combine. Cook until the sauce reaches a simmer. Then reduce the heat to medium-low and continue to let the sauce simmer for about 15 minutes. Taste, and adjust seasoning if needed.
Add in the spiralized zucchini and the seafood, toss until everything is evenly coated with sauce. Continue to cook for 2-3 minutes until the zucchini noodles are slightly softened.
Serve immediately garnished with Parmesan cheese.