"Okay!" Diarmuid settles the bowl down after taking it and then drops a berry into it. Fortunately, he doesn't seem to upset that his mouth wasn't dyed blue. He pauses then and looks up at Professor Oak, "Should I start with just one berry? Or should I use more than one? I have seen people grind stuff up before. They usually start small and work their way up!"

He doesn't know the names 'mortar' and 'pestle.' However, he does recognize what they do because he has seen things like them used.