Cut beans into very small piece. Grind coconut, turmeric, onion, green chilli together. Add one table spoon of oil in to a frying pan ( cheena chatti in malayalam) and  add mustard. When the mustard pops  add beans, garlic and mix well. Then add  the ground coconut masala and do not mix but the masala should be covered by the beans. Add curry leaf and salt to taste. Keep the pan covered  and cook in a low flame for 5 minutes. Stir well and serve hot.

For easy cooking one can add coconut, onion, chilli directly to the beans without grinding.