Aunt Bee's Lentil Soup

• 1 lentils
• 1,900 ml water
• 375 gr tomatoes
• 260 gr smoked sausage
• 190 gr tomato paste
• 65 gr carrots (sliced)
• 60 gr onion (chopped)
• 50 gr celery (sliced)
• 7 gr salt
• 3 gr oregano