Peel, core, quarter and cut the pears into chunks.
2.2 Pounds Pears
Weigh your fruits.
Slit open your vanilla bean. Cut your lime into two.
1 Vanilla Bean, 1 Lime
Place the pear chunks into a large jam cooking pot. Add to that the sugar, vanilla bean, squeezed out lime juice and 3 lime halves.
3 ½ cups Sugar
Keep the pot with the fruits on the stove over a medium-high heat setting. Bring to a rolling boil.
Then take down the heat and continue to simmer over a medium heat setting for about 30-40 or so minutes. Stir occasionally.
Keep cooking pear preserves until it has visibly reduced, changed to a darker color and appears glossy translucent.
Pick out and discard the vanilla bean and two lime halves.
Blend the jam to your desired consistency. If you keep it chunky it's a preserve, if you want to smooth, it's a jam.
Test if the jam is set with a candy thermometer. The setting temperature is 210° Fahrenheit or 105° Celsius. Or drop some of the preserve on an ice-cold plate or spoon and if it's not running, it is set. If it runs, keep the jam for some more time to cook on low heat and repeat the test until you have the correct consistency. Keep in mind that jam will always appear liquid when cooking hot.
Pour hot jam into clean sterilized jars and fill up to the rim.
Close the jar well with the lid, clean if you made a mess and turn upside down to create a vacuum.
Allow the jam to cool down to room temperature, turn it back up, label and store in a cool and dry place or use straightaway.