Task: Question Generation
Input (English): Context: Cook until potatoes are thawed and broken apart . Add the vegetable stock and boil for a few minutes until potatoes are very tender . Add the spinach and cook for a few minutes longer , until spinach is just tender . Transfer soup to a food processor , in batches if necessary , and process until relatively smooth ( it does n't need to be homogenous ; the spinach and potatoes just need to be broken up into flecks . ) Return to the pan and add the lentils .
Output (English): Why do you not have to process the soup until it is very smooth ?