Ingredients:

Tur dhal                  - 1/4 cup
Pumpkin                 - cut into cubes 1 cup
Drumstick              - 2 cut into 2" pieces
Tamarind               - small lemon size
Chilli powder         - 1/2 tsp
Turmeric powder    - a pinch
Coconut scrapings  - 1 cup
Salt                  
                                             
For seasoning:

Mustard seeds       - 1tsp
fenugreek seeds     - a pinch
red chillies             - 2 split into 2
shallots                  - finely chopped
curry leaves

Method:

Cook tur dhal  in a pressure cooker. Add the vegetables, salt, turmeric powder and chilli powder and cook till the vegetables are soft. Now add a cup of tamarind extract and boil the mixture for 10 mins. Grind the coconut scrapings into a smooth paste and add this along with 2 cups of water and  again boil for 2 mins.   Remove from fire.
Take a kadai, heat oil and add mustard seeds, when it splutters add  fenugreek seeds, red chillies, curry leaves ans finally chopped shallots. When shallots changes the colour  pour this to the curry. This curry should not be too thick.
You can substitute the vegetables  with white pumpkin(kumbalanga), avarakkai or brinjal etc