I found a chestnut tree that was loaded and they were all over the ground or what I really think are chestnuts..... I picked up a nice size sack full and came home to roast a few.... to my surprise - they were bitter! YUCK! Did I do something wrong? I wonder if these are not the "right type" for eating.... they look right and they are huge! Big huck, some have 2-3 nuts inside... maybe they are not chestnuts - how can I tell?