Clean and wash spring onions and cut them into fine rings. Peel garlic, press through a garlic press. Heat 4 tablespoons of olive oil. Fry the garlic, spring onions and lentils in it. Deglaze with 1 1/2 litres of water. Cover and cook for about 20 minutes.
Drain the lentils if necessary. Whip vinegar, 6 tablespoons olive oil, sugar, salt and pepper. Season the lentils to taste. Wash the basil. Cut the leaves into fine strips and fold into the lentil salad
With 12 people: