2 tablespoons olive oil
1 small white onion, peeled and diced
1 cup diced carrots
1 cup diced celery
3 cloves garlic, peeled and minced
6 cups chicken or vegetable stock
1 (14-ounce) can fire-roasted diced tomatoes
1 1/2 cups (about 8 oz) orzo
1/2 teaspoon dried thyme
1/4 teaspoon dried oregano
1/4 teaspoon dried rosemary
4 cups loosely-packed spinach
salt and black pepper
Heat oil in a large stockpot over medium-high heat. Add onion and saute for 4 minutes, until soft. Add carrots, celery and garlic and saute for an additional 3 minutes. Add chicken stock, tomatoes, orzo (pasta), thyme, oregano, rosemary and stir to combine. Bring soup to a simmer, stirring occasionally. Reduce heat to medium-low and simmer for 10 minutes, stirring occasionally, until the pasta is al dente.
Stir in the spinach and cook for 1-2 minutes until it is bright green and wilted. Season with salt and black pepper to taste (if needed). Serve warm.