In my childhood, my main experience with chestnuts was water chestnuts in stir fry, which I didn't like much. Weird texture.
But I have now discovered the joy of roasted chestnuts. They are delicious: shockingly "meaty" in flavor; in texture, they are soft.
You can sometimes find them sold in foil packs in asian grocery stores, and these are worth getting, but the best roasted chestnuts I ever had were roasted by an old woman on the side of the beach we paid two euros for a huge bagful from while in Portugal.
The "chestnuts roasting by an open fire" song makes a lot more sense now.