Potlakaya kobbari kura/snakegourd-coconut curry

Ingredients

• 1 long snake gourd(potlakaaya)
• 1/4 cup grated fresh coconut
• 3-4 green chillies
• 1/2 teaspoon mustard seeds
• 1 teaspoon urad dal
• 1 teaspoon chana dal
• a sprig of curry leaves
• 1/4 teaspoon haldi
• salt to taste
• 1 tablespoon oil