Heat a seasoning pan adding cooking oil, fenugreek seeds and cumin seeds. Fry these ingredients till fenugreek turns brown. Once done transfer it to a plate. In the same pan add red chillies and fry till they are crisp.
Add all the fried ingredients in to mixer jar along with grated coconut and salt. Grind together all of them in to fine paste adding little water. Transfer this paste to a container. Now include buttermilk and mix well.
Heat seasoning pan with all the "seasoning ingredients" in the order mentioned, as the mustard seeds crackle, transfer the seasoning to fenugreek seeds tambli.
Diabetic recipe fenugreek tambli is ready. Serve it along with hot steamed rice.
Note
Do not add too much water while grinding spices with grated coconut. Because it may turn too running once buttermilk is added.
You can substitute red chilly by black pepper too.