Chickpea Soup with Lemon and Potatoes

1. In a large Dutch oven, heat the olive oil and butter over medium heat.
2. Make a mirepoix** by sautéing the celery, onion, and carrot in the warm olive oil and butter until the carrot and celery are soft and the onions are translucent, roughly 5 minutes. Stir in the garlic, pepper, salt, turmeric, and crushed red pepper flake, and continue to sauté for another minute until the ingredients are incorporated and smelling fragrant.
3. Add the vegetable stock, bay leaves, chickpeas, and potatoes and bring ingredients to a boil. Once boiling, reduce the heat to low and simmer for 15-20 minutes, or until the potatoes are fork tender.
4. Use tongs to remove the bay leaves and discard. Very carefully ladle roughly half of the soup into a blender and purée until smooth. Return the pureed soup back into the Dutch oven and stir to create a creamy base, still with whole chickpeas and potato pieces throughout.
5. Stir in the lemon zest and one tablespoon lemon juice. Taste and add more lemon juice to your desired preference. Serve topped with a heaping pile of Parmesan and parsley, and a lemon slice, if desired. Add additional salt and pepper to taste.

**A mirepoix is a recipe base made from diced vegetables that are cooked slowly (usually with some sort of fat, like butter or oil) to sweeten and deepen the flavors of a dish.