If spinach is frozen, defrost completely.

Bring a pot of salted water to a boil with olive oil and lemon peel (optional).

Cook pasta according to package directions.

While pasta cooks, cut smoked salmon into small pieces.

In a pan, heat cream with pepper, stirring until it begins to simmer.

Add smoked salmon and spinach to the cream sauce, stirring to combine. Be careful not to burn.

Drain pasta and mix with the salmon and spinach cream sauce.

Transfer mixture to an oven-safe dish.

Sprinkle mozzarella cheese on top (optional).

Bake until cheese is melted and bubbly.