Answer:
The more you take away the bigger I get. What am I?
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
I have green hair a round red head and a long thin white beard.
You throw away my outside you cook my inside. Then you eat my outside and you throw away my inside.
A dagger thrust at my own heart dictates the way I'm swayed. Left I stand and right I yield to the twisting of the blade. What am I?
When is it bad luck to see a black cat?