Add salt to rice flour, mix it.Boil water until it bubbles up add it to rice flour.
Mix with a laddle,once it starts to come together,Set aside for few mins until it is warm enough to handle with hand.Now bring everything together to form a smooth dough without any cracks.If you want you can add few drops of oil if it sticks.
Heat 1 tsp ghee in a pan - add finely chopped/grated carrot and beetroot.
Saute till raw smell leaves.Cook covered for 7-10 mins in low flame.
Give a quick saute cook until it becomes slightly soft.Now add cane sugar.
Cook in low flame, it will become slightly runny after sugar is added.Keep cooking.
Once it becomes thick like this,switch off.Grease your palms with oil first.Now take a lemon sized ball and flatten it in your palms, more like a cup shape.
Place stuffing on it, bring the edges to the center and seal it to form modak shape.You can do using a mould too.Check here for detailed video showing how to shape modak.
Steam cook for 7-10 mins or until the modaks are cooked, you can see a shiny outer layer,then its perfect to switch off.