PB&J Matcha Question

I love Blank Street and do not have one near me, but I am heading to NYC this weekend and hoping to stop by. I saw they have a new PB & J matcha. Do they add the pb & j syrup to the dish where they whisk the matcha or do they add it to the drink in the plastic cup? Just asking because I am super allergic to peanuts so I am scared of the potential cross contamination in the whisking dish but still want to get blank street matcha while I’m in NYC. Ty in advance🍵🥰