Spinach Pasta Soup

I normally don't like tomatoe soup (at least not Campbell's), but this is fresh and delicioso! Not to mention uber healthy. I like to serve it with either fish or a grilled cheese sandwich on sourdough bread. Orzo pasta, by the way, is found on the pasta isle.

4 C chicken broth (low-sodium)
1/2 C water
1/4 C plus 1 Tb tomatoe paste (no salt added)
1/2 tsp grated lemon zest (optional)
1/4 C orzo or pastini (I like more, so put closer to 2/3-3/4 C)
6 C (8oz) fresh spinach leaves only, patted dry
1/4 C green onions
salt and pepper to taste

In a medium saucepan over medium-high heat, combine broth, water, tomatoe paste, and lemon zest. Whisk until smooth. Bring to a boil. (Make sure you watch it, it always boils over when I cook it).
Stir in pasta, reduce heat to medium and cook 5-7 minutes, or until pasta is tender.
Stir in spinach and green onions, cook for 2-3 minutes.
To serve stir in salt and pepper.