Cook mango and cucumber by adding turmeric powder,salt and little water.Cook till the cucumber pieces become transparent.(this indicates that it is cooked well).

Meanwhile,grind together all the ingredients listed under "no 2" adding little water.Grind to a very smooth paste.Then mix together curd and this coconut paste.Mix realy well without any lumps.

When the mango and cucumber are cooked well,add this coconut-curd mix to it(simmer the flame before adding).Then keep the flame to lowest and cook till the curry is just about to boil.Immediately switch off the flame.In another pan heat coconut oil and splutter mustard seeds and fenugreek seeds.Add dry red chilli and curry leaves.Pour this tempering into the kalan and mix well.