The sweet-tart flavor of apricot jam goes outrageously well with something creamy, like labneh (or cream cheese, or ricotta, or...you get the picture) on toast made from really good bread. Use whatever size jars you prefer and fill them to 1/2 inch from the top.
Pit the apricots by splitting them between your thumbs and removing the pit. If they are not ripe enough to split by hand, run a sharp knife through the flesh around the pit, pull apart, and remove the pit.
In a large heavy saucepan, add all of the ingredients Cook over medium heat until the sugar has melted and the mixture begins to simmer.
Reduce heat and simmer over low heat, stirring frequently with a wooden spoon until the apricots are very soft and falling apart, about 1⁄2 hour.
Reduce heat and simmer over low heat again, stirring frequently until the mixture thickens and the apricots have softened but some pieces still remain, another 1⁄2 hour.
Taste. Depending on how tart the preserves are, and how tart you like it, add more lemon juice or more sugar.
Off the heat, allow the jam cool for 15 minutes, then ladle into clean jars fitted with a canning funnel to prevent drips. Cover with the lids and refrigerate.