Set a large pot on medium high heat. Once hot add olive oil and sausage. Cook the sausage until sear marks appear along the edges, about 3 minutes. Reduce the heat to medium.
Add garlic, onion, tomatoes, seasoning, pasta and water. Bring to a simmer. Use tongs to stir the pasta as it cooks and softens. Continually stir and fold the ingredients together as the pasta cooks, about 8 – 10 minutes. Cover the pot if needed but monitor to make sure it is not burning, and as more liquid as needed.
When the pasta is nearly 95% cooked, fold in the frozen spinach to thaw.
Season to taste with sea salt & pepper.