Fresno Smoked Sausage And Lentil Gumbo

• 4 stalks celery
• 2 onions
• 2 carrots
• 1 3/4 lentils
• 1 worcestershire
• 1,900 ml chicken broth
• 190 gr smoked sausage
• 80 ml alad oil
• 40 gr flour
• 1 gr pepper