How to make the first order tag free

How would I go about making the first quanitty order tag free but after that it costs extra.
My setup is for selling hot Chocolate’s and marshmallow, the price of the order includes one marshmallow but any extra cost $0.50 how do I put this in?

Have you find a way to resolve this? I’m using sorted order tax in order to give the first order tag free. Not so efficient, but I only figured out that way.

At a guess I would say,

Order Tagged Rule
–> Constraint using report expression to count tags
–> action to update order tag to 0 price.

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