Easy Cream of Broccoli Soup

In a large saucepan, heat oil over medium-high. Add onion; season with salt and pepper. Cook until soft, about 5 minutes. Add broth, broccoli, potato, and 2 cups water; season generously with salt. Bring to a boil. Reduce heat, and simmer until broccoli and potato are just tender, about 4 minutes.

Working in batches, puree soup in a blender (fill it no more than halfway) and return to pot. Stir in cream and lemon juice; season with salt and pepper.