Lentil & zucchini soup

Ingredients:
2 red capsicums
1 zucchini
1 leek
250 gr lentils
1 l water
mix of spices for soups
salt
pepper
thyme
1 tsp brown sugar
2 tblsp vinegar

Wash the vegetables and cut them in thin slices. Wash the lentils and cook them in the water with the spices for 30 minutes (or 15 in pressure cooker). When the lentils are cooked, add the rest of the vegetables and cook 10 more minutes on low flame. Add salt, pepper, sugar and vinegar before serving and decorate with some thyme.