Soak jaggery in warm water(till immersing level) , crush it well. Then heat it up until it is slightly thick (no string consistency needs to be checked). Strain and keep aside.
Dry roast peanuts until nicely browned as shown, the skin will start to splutter at this stage switch off. Cool down then remove the skin and set aside.
Transfer to a mixer jar and powder it coarsely. Now take jaggery syrup in a pan.
Cook until it is thick like honey, now add peanut powder and cook.
Cook for 2mins by then it will start to thicken, add coconut. Keep cooking.
At one stage it will start to leave the sides of the pan, add cardamom powder, mix well. When it is thick as in the 2nd pic switch off. The 3rd tile pic is few mins after cooking, it will get thick as it cools down.
Now prepare the outer dough. Measure and take rice flour in a mixing bowl, add salt.
Mix it once. Boil water until it bubbles up, switch off then add it to rice flour.
Mix with a ladle, 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.
Now the stuffing and the outer dough is ready. Take your cookie cutter dip in rice flour /oil and keep it ready. Pinch 2 lemon sized balls, take one and flatten it slightly thin now keep the stuffing. I have kept the cookie cutter just to show there should be enough gap between the filling and cutter, just for size reference. Once you add the filling, keep the cookie cutter aside.
Now take another ball, flatten it up as shown. Slightly spread the filling and seal with the dough. Now press it along the sides to seal it completely.
Now using your cookie cutter cut it. Make sure you trim leaving some area which is sealed while you cut so that it doesn't open up while steaming. Also while cutting make sure not to trim the stuffing area(this is why I used the cutter to measure the size in step 9)Now remove the extras and gently pull out.
Likewise shape all the kozhukatais with stuffing. Arrange it in the steamer plate and steam it for 10mins or until the kozhukattais look shiny.