In a blender coarsely ground the fenugreek, coriander, fennel and cumin seeds.
In a saucepan put the oil and add all the ingredients except the sugar. Mix it well.
Cook over medium heat until the rhubarbs are tender. This should take about 4-6 minutes. Stir the rhubarb occasionally to make sure it does not burn from the bottom.
Add sugar to the rhubarb and cook on low heat for about 1 minutes after rhubarb start sizzling.
You can refrigerate this chutney for about 6 weeks.