Ingredients:
1 cup field beans/vaal dal
1 tablespoon oil
1 tablespoon mustard seeds/rai
1 spring curry leaves/patta
1 onion, chopped
1 teaspoon ginger-garlic paste
1 teaspoon garam masala
2 big sweet potatoes, peeled & cut in large pieces
1 lemon, juiced
2 tbsp coriander leaves, chopped

Preparation:

Boil vaal dal with water till mushy. Mash smooth and keep aside.
Heat oil and fry mustard seeds, curry leaves and onion followed by garam masala and ginger-garlic paste.
Add sweet potatoes. Cook till they soften.
Add boiled vaal dal, salt with some water. Cover and simmer.
Add lemon juice just before serving and garnish with coriander leaves.

Serve with rice or rotis.