Patrick (from "Bushcraft am limit" youtube channel) says they taste like chestnuts. I tried them right away. I found them very bitter, but my variant was from a sycamore maple (maybe another taste? :-) ) and they germinated already. If you remove the peel around the seedling it gets much milder, the shoot itself tastes more intense. My kids also got 2-3 and found it very funny and interesting.
Helps against fever, ulcers, bruises etc.
Bushcraft am limit: https://www.youtube.com/watch?v=7rMXz8vHfJ0