I...I don't know. I just don't know.

(Okay, actually I do, sort of; it's one of her spellcards, right?　「粥」 is something like gruel; 『神の粥』makes enough sense. But what's「筒粥」supposed to mean, exactly?)

Rice gruel?

Though I can't read them, http://touhou.wikia.com/wiki/Mountain_of_Faith:_Stage_6_Spell_Cards#Spell_Card_82 has some explanations.