Wash white cow beans and kidney beans separately.
Soak them separately, overnight in plenty of water. wash and soak the green moong beans for about two hours.
Boil the three dry beans separately in salted water till soft. drain and let them cool..
Strain the french beans and cut into one-fourth inch pieces. boil in salted boiling water till done.
Drain immediately and refresh with cold water. drain and keep aside.
Peel and cut onion into one-fourth inch size pieces. clean, wash, drain and chop green coriander and mint. wash and chop green chilies finely. peel and wash and chop it.
Dilute lemon juice with equal amount of water. stir in chopped green coriander, mint, green chilies and chaat masala.
Shake well and refrigerate the dressing for at least an hour.
Mix all the cooked beans with diced onion and add the dressing. toss the salad to evenly mix the dressing.