In a mortar add 1 small jalapeno ( or 1 green chili), one inch ginger and a handful of coriander leaves. Make a coarse paste.
Peel the pumpkin and cut to long strips as shown in the step by step process.
Heat a tablespoon of oil in a skillet and add ½ teaspoon mustard seeds. Let the mustard pop. Reduce the heat to low and add one teaspoon of cumin seeds, 1 sprig curry leaves and ⅛th teaspoon of fenugreek seeds ( about 12-15 fenugreek seeds). Cook them for 15 – 20 seconds.
Adjust the heat to medium and add pumpkin slices. Coat the pumpkin with the tempering and cook for a minute.
Add a pinch of asafetida, ¼ teaspoon turmeric powder, ½ teaspoon red chili powder, 1.5 teaspoon coriander powder, ½ teaspoon cumin powder, ¼th teaspoon brown sugar (or jaggery), salt to taste and coriander jalapeno ginger paste. Coat the spices with the mango and cook for 5 minutes.
Add one cup water, cover and simmer the curry for 10 -12 minutes till the pumpkin is soft.
Add 2 tablespoons of thick coconut milk and cook for 5 minutes. Finally add some lemon juice and coriander leaves. Taste and adjust salt.