Preheat a 4 quart soup pot over medium heat. Saute onion and celery in the oil with a pinch of salt until soft. Add garlic and cook until fragrant, 30 seconds or so.
Add carrots, potatoes, thyme, tarragon, vegetable broth and salt. Cover and bring to a boil. Once boiling, lower heat to a simmer, add pasta and cook until pasta and vegetables are soft, about 10 more minutes.
Add agave, tomato sauce and frozen peas and heat through (5 minutes or so.) Remove from heat. It tastes better the longer you let it sit, but give it at least 10 minutes. Taste for salt and seasoning, and serve.