1Make the Bouquet Garni:
Put all of those ingredients (found at the bottom of the ingredient list) in the center of a 6 inch square of cheesecloth. Bring the corners together and tie securely with kitchen twine.
2Heat olive oil in a large pot or Dutch oven over med-high heat. Add the chorizo and cook, stirring, until it has rendered its fat and is beginning to brown - approx. 3-4 minutes. Add the onions, celery, and carrots and cook, stirring, until veggies are softened - approx. 3 minutes. Add salt and pepper and stir well.
3Add kale, garlic, the bouquet garni, chicken stock and red pepper flakes. Bring this to a boil over high heat, stirring once and a while, until the kale is tender - approx. 30 minutes.
4Add clams and cook until they all open - approx. 10 minutes. Discard any unopened clams.