Thanks.
Glad I could fill you in on the Peruvian groundapple :0)
I’ve read about people using cold frames in piles of snow. Niki Jabbour has written a popular book about it. This is one of her articles (link to the book is in the article): https://savvygardening.com/cold-frame-gardening/
Oh great thank you for the link and the idea about snow!