The phrase "fresh rhubarb" refers to rhubarb that has just been picked and is still very new. It indicates that the rhubarb is recently harvested and has not been stored for a long time.
Sentences with «fresh rhubarb»
I made this last summer and it was delicious; plan to make it again now that I've got lots of fresh rhubarb from the garden. (mybakingaddiction.com)
As soon as I see fresh rhubarb in the market, I will do so. (seitanismymotor.com)
Another vote for how this reminded me of fresh rhubarb from the garden growing up. (jessicalevinson.com)