Cut the potato into 2cm cubes. Toss in a little oil and put into a hot oven at 200 for 10-12 minutes until golden and just cooked.
In a deep pan, add butter, oil, diced onion, garlic and ginger. Cook until caramelised.
Add the cumin,garamasala, and tumeric. Cook for 30 seconds, then add the green chilli.
Add the chopped tomatoes and simmer for 5 minutes before stirring through the spinach puree.
Once th epotatoes are cooked, add them to the pan and stir to combine. Season to taste, then fisnish with the fresh spinach and fenugreek leaves. Cook for another 2 minutes until the fresh spinach is just wilted.
Serve as a side to the Sri-Lankan Fish Curry or as a main dish