Simple soup with lentils and sausage Recipe

• 1/2 onion, chopped
• 1 tbs olive oil
• 1 carrot, thinly sliced
• Celery stalk, thinly sliced
• 1 1/2 cup smoked sausage (about 200 g), sliced
• 600-800 ml water
• Bay leaf
• Celery
• 250 g canned lentils, washed and drained

Directions