Blanch tomatoes -2 min- plunge cold water, core, peel & quarter. In a bowl mix sugar with tomatoes and cover with plastic wrap let stand 6-12 hours in the refrigerator. (This is called macerating the tomatoes)
Drain the liquid from tomatoes into a saucepan. Tie the pickling spices and ginger in cheesecloth .
Bring the tomato liquid to a boil and stir until syrup forms a thread- 220 degrees F. on a candy thermometer. (This is how you know it will set)
Add tomatoes, lemons, and spices. Reduce heat to low and cook tomato mixture until dark red and translucent.
Skim off any foam - remove spices -with plastic utensil remove lemon slices place in bottoms of sterilized jars.
Ladle preserves into half pint jars leaving 1/4 inch headspace. Wipe rims and add hot lid/ring. Process the jars for 20 minutes in a boiling water bath. Do not start timing until the water has come back to a full rolling boil.