Scrub sweet potato and wash thoroughly to remove the dirt on the potato.
Peel the skin and grate it. I personally do not transfer the grated potatoes into the water but if you want to you may transfer the grated potato into clean water so that potato does not oxidize.
In a pan or thick bottom kadhai, heat ghee and add cumin seeds.
Once the cumin seeds start to sizzle, add finely chopped green chillies and mix well.
Now add the grated sweet potato / ratala and mix.
In case you have kept the grated potato in water, then make sure to squeeze all excess water from ratala otherwise the kees might turn soggy.
Add salt and sugar, mix well and cover the pan with a lid.
After 5 minutes, when the ratala is half done add roasted peanut powder and mix well. Check for seasoning at this time.
Cover the pan with a lid and cook for 15-20 minutes, stirring occasionally in between.
Once the kees get nice steam and the grated potato is tender they will look transparent and glazy.
You may at this time add finely cut coriander leaves and scraped coconut if you want. I generally don't like it hence I avoid it.
Ratalyacha kees is ready. Serve it hot.