Dissolve the sugar and salt in boiling water. Add any flavorings you want, and mix until combined. Then add the rice flour and mix well into a paste. You're looking for something close to really thick peanut butter (think an un-stirred jar of natural peanut butter) or slightly wet cookie dough, so add more water as you see fit to reach this consistency.
Transfer the paste into a well-greased (I like using cooking spray, especially if you're trying to use a decorative pan) 10” round cake pan, smoothing as best as you can (it’s okay if it’s still lumpy on top).
Recipe from Aunty Myra!
Nian gao is typically only sugar, water and rice flour, but you can add other flavorings if you want: citrus zest, fresh ginger, extracts. The only mod I like to make is swapping half of the water for light coconut milk, since it gives the nian gao a bit more flavor, without changing the traditional flavor too much.