Buttermilk Cucumber Curry/Moru Curry

Take water in a pan. Add the chopped onion, cucumber, turmeric powder, chilly powder, 2 curry leaves, ginger paste and salt into the water.Close and heat on a medium flame until the cucumber is well cooked. Remove from heat when cooked and keep it aside to cool down.When cool, add the buttermilk into it and heat on a medium-low flame while continuously stirring. Remove from heat when it starts to boil. Do not boil or the buttermilk will look coagulated. I made the buttermilk by beating the curd in a blender Heat a pan, add the oil, then add the fenugreek seed, mustard seed, dried red chilly, onion and curry leaves in the same order. When the onion becomes golden in color, remove from heat and garnish on top of the curry.