How to get my bunny to play with pinecone?

Bought a readymade one from China and he loved it. Flung around and ate it. Figured it would be better and cheaper to get and clean them myself. Collected 4, soaked with water and vinegar, rinsed, cleaned and baked until crispy. That was his response. Left one in his enclosure and he ignores it. What did I do wrong?