Twist the physalis out of the flower and cut in half. Layer with the brown sugar and the sliced vanilla pod in a sealable glass and pour vodka over it.
Place in a bright but not sunny place and shake every day until the sugar has dissolved. Let it steep for a total of 6-8 weeks, then pour through a sieve, fill into bottles and close.
Tip: The physalis from the alcohol taste great with vanilla ice cream or with other fruit in jam.