Made using a birch burr that was at the top of a youngish tree as part of a thinning operation I did recently.
The growth inside was normal grain though with out all the faces and knots, but I went with the natural shape, carved quick and dried it slow in chippings then an open bag. Luckily it's not cracked!
It lent itself to a Right handed person so I went with it, then it bent slightly the same way as it dried. Feels really comfy to use, and size wise 250ml ish great for strong coffee, a drop of wine or a wee dram of Islay malt :)