The tree that this fruit comes from was saved
and transplanted 18 months ago when we moved into this house. It
smells like a citrus and spikes like some lemon and lime trees have.
With this knowledge we assumed that it was a lemon / lime tree. This
tree has struggled somewhat with its move but this year produced fruit.
Surprisingly we have no idea what the fruit is. The fruit is quite
lumpy and bumpy. We have not tasted it as we are not even sure if it is
safe to do so. We don’t even know if the photo shows the fruit ripe.