I got a proper tool for whipping things and holy shit this thing is wild.
Information: It appears that using oat milk as the base for the whipped coffee doesn’t work.
It also seems that the water must be hot to melt the sugar.
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@EnochianEntropy Not all oatmilks are equal, many "break" in hot liquid. Have had good results whipping Kirkland (Costco) or Oatly "barista"