Step 1Combine sugar and water in a saucepan and bring to a boil. Boil until slightly thickened, but not thick like honey.(If the syrups are too watery, they won't stay on the ice.) Cool to room temperature.
Step 2To 1 cup syrup, add the rose extract and, if desired, red food coloring until you have a bright red syrup.
Step 3To the remaining three-fourths cup syrup, add the pandan extract and, if desired, green food coloring.
Step 1Use four large shallow bowls. In the bottom of each, spoon 2 tablespoons each of the palm seeds and the red and white beans, draining lightly as they are spooned from their jars.
Step 2Spoon 3 cups shaved ice over the seeds and beans in each bowl, forming a mound that's high in the center.
Step 3Combine the evaporated milk and sweetened condensed milk and drizzle evenly over the ice in each bowl.
Step 4Spoon the syrups over the ice, making any desired pattern. Arrange the jackfruit over the top. Serve immediately.