Simplify the following text for a Grade 8 native English-speaking person.
Original: Red or green lentils may be used and in some recipes the lentils are boiled with vegetables such as carrots , potatoes , parsley and onion , and then pureed .
Simplified: Red or green lentils may be used . Other ingredients may include vegetables such as carrots , potatoes , celery , parsley , and onion .