Heat oil in a soup pot. Add onions, carrots, and celery and sauté 3 minutes. Add garlic and rosemary. Mix vegetable broth powder and hot water. Add beans and vegetable stock to soup pot and stir. Bring soup to a boil. Reduce heat, cover and simmer for 10-15 minutes. Ladle half of the soup into a blender. Add lemon juice and blend until creamy. Pour soup back into the pot. Add kale and bring to a boil. When kale is slightly wilted, season with salt and pepper.