Place apricots and cold water in a saucepan and allow to soak overnight (or at least 10 hours).
Place saucepan on stove and bring to the boil. Boil, uncovered, for 20 minutes or until the water has evaporated and you're left with soft and mushy apricots.
Take the saucepan off the heat and use a potato masher to mash up the apricots.
Add the sugar and place over low heat. Stir over low heat until sugar has dissolved. Bring to the boil, increasing temperature if necessary, and simmer for 5 minutes, stirring from time to time (to ensure jam isn't sticking to bottom of saucepan).
Take jam off the heat and stir in the lemon juice and vanilla extract. Place over medium heat and boil again for about 3 minutes or until the jam reaches setting point. The best indicator of setting point is when the mixture looks shiny and "grabs" the bottom of the pan a little as you stir (if you drag wooden spoon across the bottom of the pan you can see the bottom of the pan briefly as you do this).
Pour hot mixture into sterilised jars and seal immediately with lids.
Notes
Storing: Once cooled, place the jars in the fridge and store for up to 6 months (unopened) or 2 months (once opened). There is the option of "canning" this jam so you can store it for longer periods on the shelf in your pantry. However, you'll need to rely on your own knowledge of canning and preserving as the process is too extensive to cover here.Nutrition: The nutrition information is an automatically generated estimate and is not guaranteed to be accurate.