In a large pot, heat the olive oil over medium heat. Add the diced onion and sausage and sauté for about 8 minutes, or until the sausage starts to brown and the onion softens.
Add the chicken broth and water, and bring to a boil.
Add the butternut squash and stir in the kale leaves and kidney beans. Bring to a boil, and continue to boil for 5 minutes, or until the butternut squash is fully cooked and pierces easily with a fork.
Remove from heat and stir in the lemon juice and parsley.