Some things you just can't substitute... like, a food processor cannot be replaced by mortar & pestle...
-On making pesto-
Christine: a mortar & pestle would work too, right?
me: that...would take you forever
me: so don't do that
Christine: it worked well for KBr
me: haha
me: but do you eat KBr
Christine: the IR machine did
me: hahaha