Directions:
Weigh 3/4 of a pound of sugar for each pound of fruit. After washing the plums carefully, put them in a preserving kettle with just enough water to keep them from sticking to the bottom. Set them over a moderate fire and let them simmer for half an hour; then turn them, juice and all, into a colander, filling the colander not more than half full. Have the colander set over a large earthen bowl. With a potato masher, press juice and pulp through the colander into the bowl, leaving skins and pits as dry as possible. Remove these from the colander and repeat the process until all the pulp and juice is pressed out; then pour it into the kettle and, while it is heating slowly, heat the sugar in the oven.
As soon as the juice and pulp begins to simmer stir in the hot sugar, and when it drops from the spoon like a thick jelly pour it into the glasses. This is one of the most delicious fruit preserves made and is always acceptable with meat and poultry or as a sweetmeat at afternoon teas.