Wash the fruits to remove the debris.
Cut the stems off the strawberries, and cut them into half. Set them aside.
Cut the top and bottom of the kiwis. Peel the skin with a peeler. Then, cut them into 0.25cm thick slices and set aside.
Remove the skin of the orange and remove the seeds, if any. Cut them into half and then into bite-sized cubes. Set them aside.
Open the can of longan and strain the syrup into a measuring cup. Note the volume of the strained syrup. Place the rest of the longan into a bowl.
Add a layer of strawberry halves, kiwi slices, orange cubes and longan pieces into the mould. If preferred, arrange them to the desired pattern.
Check the jelly powder manufacturer's instructions for the amount of liquid needed for each packet of jelly powder.
Pour all the syrup into a saucepan. Add water accordingly to get the amount needed to cook the jelly. Add the sugar, salt and jelly powder to the saucepan. Stir until all the jelly powder has completely dissolved.
Transfer the saucepan to a stove over medium heat. Stir continuously to cook the jelly for about 6 minutes, or until the jelly mixture has started to bubble and boil. Switch off the heat and set it aside.
Immediately scoop the jelly mixture into the mould. To preserve the pattern at the bottom of the mould, add just enough jelly mixture to cover the base of the cake mould. Set the mould aside for the jelly to harden for about 15 minutes, while keeping the rest of the jelly mixture on the stove over low heat. Once the first layer of jelly has hardened, run a fork through the surface of the hardened jelly, swirling as much as possible while avoiding the fruits.
Add the rest of the fruits, alternating with the jelly mixture. Once the cake mould is filled completely, set it aside for the jelly to harden completely.
For the best eating experience, keep chilled in the fridge once completely cooled before serving.
To serve, gently push a thin blade or knife along the sides of the cake mould and jelly cake. Gently push the sides of the jelly away from the cake mould. Then, place the serving plate upside down over the cake mould, Carefully flip the plate and cake mould together, and carefully shake the jelly cake out.
Cut to the desired size and serve.