Meyer Lemon marmalade failing plate test

Question

I've been cooking a batch of meyer lemon marmalade for about an hour. On my fifth plate test and it's still super runny. Any advice? Help!

Greenstuff · Answer

Hope you didn't lose heart!  Sometimes jams take what seems to be forever.

jankak · Answer

Cook it to 220 on a candy thermometer. It takes a while but is fail safe.  This is without added pectin.