You have identified the one and only multi-usable item which actually creates something when you use a single one. At the moment, it is marked single-usable.
Presumably, we could mark it multi-usable. It might take some fiddling to make "use 3 peppermint sprout" go to MultiUseRequest and "use 1 peppermint sprout" go to SingleUseRequest. Or, perhaps we could simply make the conoction for "peppermint twist" be a MUSE concoction, rather than a SUSE concoction.
This is a good demonstration of why it is better to ask "how do I accomplish end goal" rather than "how do I do such-and-such an action (with the hope or expectation that that will lead to end goal)".