Mary Jane's Lentil Soup

Very healthy and yummy soup - and my kids will even eat it! This is my slightly modified version after making this many, many times.

1 cup dry lentils
3/4 cup chopped onion
3/4 cup chopped celery
3/4 cup chopped carrots
3 Tbs. fresh parsley chopped (or 1 Tbs. dried)
1 clove garlic, minced
1 1/2 tsp. salt
pinch crushed red pepper flakes
1/2 tsp. dried oregano
2 cups chopped tomatoes with juices (fresh or canned)

Rinse lentils; drain and place in soup kettle. Add 4 cups of water. Simmer covered until tender but not mushy (about 30-45 minutes). Meanwhile, saute all vegetables (except tomatoes) and herbs in 1-2 TBS. olive oil until tender (appx. 20 minutes). Add sauted vegetables and tomatoes to the undrained lentils. Simmer covered about 30 minutes longer. Season to taste.