Ideas on how to preserve garlic mustard

I saw the first garlic mustard pop up a few days ago! Soon it will be all over. I would like to collect all I can so I can eat them during the winter. Do you think I can just blanch and freeze them like you can do with spinach? I also thought I remembered it being pickled into a popular asian condiment but no search results turn up. I will have to try pesto too (perhaps I can freeze the pesto).