Add 3 to 4 cups water to a heavy bottomed sauce pot and bring it to a boil. Add the sago and cook for 12-14 minutes. Switch off the stove, close and allow it to cook in its own steam for another 10 minutes to turn glassy and transparent. Drain the water and set aside.
Boil the sweet potates for about 10-13 minutes until fork tender. Reserve the cookded water. Peel and chop the sweet potatoes
Bring the sweet potato cooked water to a boil and add agar agar powder, pour it into a bowl to set. Cut into cubes afetr it is set.
To assemble: Add the sago pearls, cooked sweet potato cubes, jelly, jackfruit, and tender coconut.
Mash some sweet potatoes in milk.
Add the condensed milk, evaporated milk, and sweet potato milk to the mixture. Add ice cubes. Mix thorughly.
Serve chilled.