Hi Eva- Yes you could use Rhubarb for our teacake, we are currently using it in ours right now. We do make a compote with our Rhubarb before adding it to the teacake. That involves macerating rhubarb in sugar, simmering until al dente, straining out the fruit, cooking down the syrup a bit further and then mixing the fruit back into the syrup. Enjoy!
That's a question that would be best asked to the bakers directly - not the public!
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