I think, I saw someone's post on purple sweet potato balls (Ondeh) on Instagram that got me into making them. It happened that I had some purple sweet potatoes at home and I love coconut. Also, I always have grated coconut in the freezer. Instead of palm sugar for the filling, I substituted it with grated coconut, cooked in palm sugar. I ended up with a lot of them, although it was not my intention to make that many. We gave them away after we had some.
A couple of days later, motivated by the fact that I actually some leftover boiled sweet potatoes, and these ondeh are delicious, I made more of them.