Italian Lentil Soup

• 8 kalamata
• 2 garlic (cloves)
• 1 lentils soaked
• 1 onion (white)
• 950 ml water
• 450 ml cans tomato sauce
• 150 gr corn (frozen)
• 90 gr cheese tortellini
• 85 gr mushrooms (sliced)
• 30 ml olive oil