Tomato & Balsamic Spaghetti Soup

I veganized this recipe from a Rachel Ray magazine dish I saw. It saw serves 4 but I think more like 8!
This kind of reminds me of a nicer, fresher version of the canned SPC spaghetti I used to eat on toast when I was a kid. I'm a little bit of vegan cheddar or Parmesan would be delicious as a topper!
Disclaimer: if you are prone to acid re-flux this vinegar/tomato combo tends to repeat on you. If so skip the vinegar,

Tomato & Balsamic Spaghetti Soup

Ingredients

2 tablespoons vegan butter
1/4 pound GF spaghetti, broken into 1-to 2-inch pieces
2 tablespoons olive oil
1 onion, chopped
1 rib celery with leafy top, chopped
2 carrots, grated
2 cloves garlic, sliced
Salt and pepper
1 tablespoon agave syrup
2 tablespoons balsamic vinegar
1 28 ounce can  whole peeled tomatoes
2 cups passata or tomato puree (I used a cup of tomato paste mixed with a cup of hot water)
1 quart vegetable stock
A few leaves of basil, torn
Minced fresh parsley


Method

In a small skillet, melt the butter over medium heat.
When the butter foams turn down to low-medium, add the uncooked pasta and cook, stirring often, until toasted and golden, about 3 minutes.
Meanwhile, in a large pot heat the olive oil over medium to medium-high.
Add the onion, celery, carrots and garlic; season with salt and pepper.
Cover and cook, stirring occasionally, until the vegetables are tender, 6 to 7 minutes.
Uncover, stir in the agave, then stir in the vinegar, scraping up any browned bits on the bottom of the pot. Add the tomatoes, passata and stock.
Using an immersion blender or working in batches in a food processor/blender, puree the soup.
If using a food processor, return the soup to the pot and bring to a boil.
Add the toasted pasta and simmer until tender, about 8 minutes.
Divide soup among bowls; top with basil and parsley.