Need a good recipe for a mustard plaster

Can some please give me a recipe for a good plaster.

I have used the old fashioned recipe: 3 tblsp, plus
1 Tblsp. dry mustard and just enough boiling water to make a paste. (Is this correct)
I can't find my recipe, so i was wondering if there is another good recipe out there that would work better.

I have heard of the ginger/mustard recipe.
Can anyone give a recipe on this as well.

Thanks

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