Old Fashion Lentil Soup - cooking recipe

Ingredients

2 cups lentils
1/2 cup onion, chopped
1 cup celery, chopped with leaves
1/2 cup carrot, chopped
2 tablespoons butter
2 tablespoons flour
1/4 teaspoon salt
1/4 teaspoon paprika
1 tablespoon vinegar (optional)
1 cup tomatoes, diced and strained

Preparation

Soak lentils for 12 hours in 6 cups of water.
Drain. Put in pot with 12 cups of water and ham bone. Bring to a boil. Cover and simmer on low for 3 hours.
Add chopped onion, celery and carrots. Simmer for another hour. Thicken by adding butter and flour. Add paprika and salt to taste.
Just before serving add 1 vinegar or strained tomatoes. Serve.