I've had one out of a coconut...WOW try to carve a hole through that shell...NOT EASY hehe
We do watermelon as bases.
Peach, oranges, lemons, and apples on top for small fruits.
And watermelons and pineapples on top for large fruits.
Actually, we stopped using peaches only because they get too moist too fast. You get great smoke out of a apple!