I'm new to this forum so I hope I'm not being repetitious. I made a bowl from the healed over stump of a Douglas Fir. I've seen this before where a tree is cut but the stump remains alive by using the root system of a nearby tree that was not harvested. But this one is unique in my experience. The stump completely healed over into solid wood. Except that there's a little pitch pocket (now crystalized) dead center in the bottom. I want to fill this with something so make a bowl suitable for salad. Any ideas?