I made Oak Leaf wine way back in the 1970's and won first prize with it in our winemakers show.
I made five gallons and use a bucket full of young leaves and poured boiling water over them. The smell was unbelievably divine. I doubt if you would need that much rosemary. I forget how much sugar I used, and can't find my old notes, but I reckon if you made it up to 1.080 sg it would be close. I think I also added some lemon. I would have added nutrient as there isn't much there for the yeast to feed on.
Be interesting to see what happens as we also have a lot of rosemary. Meanwhile I'll continue the hunt for my notes as I have 50 pounds of honey to dispose of - the bees are working well at the moment and will go all summer - and I can't remember my old Mead recipe. The trouble with bee keeping is that one gets so much honey that all you can't possibly eat or sell it all, so the last resort is to turn it into booze. This produces another problem in that you simply change the problem into too much booze.
blanik
EDIT: I just remembered that oak leaf was a fairly 'thin' wine and I added a handful or so of raisins to give it some guts. More when I find my notes.
Just a simple potstiller.....single run of course
(50 litre, propane powered pot still)