I don't have my grandmothers orginal recipe, but I found this one on-line. It sounds very similar to what she used to make. Grandmother, I love and miss you so much. We'll cook together again one day.
BetK
Green Tomato Preserves
As post in The Daily American / Nashville, Tennessee
November 16, 1883
Green tomato preserves are in high favor in certain localities, and are entirely unknown in others. Here is a reliable recipe for making them: Take one peck of hard and unripe tomatoes, scald them by pouring boiling water over them, remove the skin and cut them into thin slices; slice also 6 lemons, the skin of the lemon is to be left upon them, but the bitter seeds must be removed; scatter six pounds of brown sugar over the tomatoes and one heaping tablespoonful of ginger; put into a large kettle and let them boil slowly until they are tender; skim them thoroughly; can just as you do any other preserves.