Interesting. Looks like fun.
We don't do that in Slovenia, but we do a similar (not really) thing on the Saturday before Easter. It's called blagoslov ognja and is the first ritual and blessing of the day. A priest blesses the fire and then people light mushrooms with it and take them home, where they put them on the fireplace (at least in the past). On St. John's day people used to light bonefires but one doesn't really see that a lot. And on St George's day (Jurjevo) a guy dressed in green went from house to house and people gave him food and money in exchange for his blessing and good luck. So no lilanje in Slovenia …

kresilne gobe at blagoslov ognja

zeleni Jurij on Jurjevo