In a large soup pot or Dutch oven, combine the butter and the oil over medium-low heat. When the butter is melted and bubbly add the onion, pesto and Italian seasoning. Cook 4-5 minutes until the onion is soft and the mixture is very fragrant.
Add the chicken stock, tomatoes, carrots, potato, basil, brown sugar, baking soda, 1 teaspoon kosher salt and pepper. Bring to a boil then cover and reduce to a steady simmer. Cook for 20-25 minutes or until the carrots are very tender.
Add the Greek yogurt and the additional tablespoon of pesto. Using an immersion blender or a regular blender, puree the soup until nice and smooth. If using a regular blender wait for the soup to cool a bit. Then blend with the middle cap of the blender top off and several layers of paper towel or a clean kitchen towel over the opening to prevent splash back. You can also use a small funnel over the opening. The idea is to let some of the steam escape so there’s not an explosion from steam build-up in the blender.
Taste and add more seasoning, if needed. Serve with, freshly ground black pepper, shaved Parmesan cheese, toasted pine nuts and fresh basil leaves for garnish, if desired.
Notes
See Café Tips above in the post for more detailed instructions, tips and suggestions.Nutritional information does not include garnishes.