I actually use Snack Pak lemon pudding cups - as a hobbyist they are inexpensive, easy to find, and shelf stable. They were recommended to me by my first Wilton instructor. My brother-in-law sells for Conagra Foods (who makes Snack Pak) and assures me they do NOT require refrigeration even after opening - unlike other brands that retail out of the refrigerated section of the store. I get rave reviews for my lemon buttermilk cake with the lemon pudding filling.
I buy the Dickenson's lemon curd at Wal Mart and mix it with buttercream. Everyone loves it.
Just to clarify - I'm not pushing Snack Pak because of the Conagra connection to my BIL. I only mentioned that because I have been asked before if it was shelf stable and that was the best way to check. As I mentioned, the idea originally came from my Wilton instructor.
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