Puree 1 cup pineapple chunks. Mix puree and sugar well in a pan and cook for 4-5 minutes stirring occasionally. Keep it aside.
In another pan, heat oil and ghee. To it, add rawa and fry continuously till it turns golden brown.
Boil 3-4 cups of water while rawa is frying
While rawa is turning golden brown, add elaichi powder, kesar milk and pineapple chunks and cook for 2-3 minutes. Keep few chunks of pineapple aside for garnishing.
Add boiled water to the golden brown rawa and keep stirring till rawa cooks and moisture evaporates.
Add sugar substitute to the cooked rawa. Stir till sugar substitute melts completely.
Now add cooked pineapple puree to the above cooked rawa and cook for 3-4 min till moisture evaporates.
Turn off the heat and cover the pan with a lid for few minutes.
Garnish with fresh pineapple chunks while serving.