How do they do that - pear in a bottle?

They put the bottle on the tree branch while the pear grows. I imagine the success/fail rate must be high.

The more traditional liquors are done by placing the bottle on the tree and having the pear/fruit grow inside the bottle.

Nevertheless, while vacationing in Brazil, they were selling cachaca bottles with everything you can imagine inside a bottle (fruits, crabs, plants, etc). The work was very rustic and rope as tied around the bottle for decoration. Turned out they where cutting the bottoms of the bottles out, putting the stuff inside and then gluing it back together. They would hide the cut with the rope decoration....

Because the bottle is placed over the baby pear (or other fruit) while it is still growing on the tree. So - the pear grows inside the bottle. I know, I watched Martha Stewart.

Coke bottle

The bottles were actually placed and tied onto the budding fruit and were grown inside the bottle...

As far as I know they insert the pear before they seal the bottle (I mean mould the bottle/glue etc.)

They are grown in the bottle and when they are ripe they are picked.

They pump it in the bottle