Prepare the Pears: Wash, peel, core, and chop the Asian pears into small chunks. Place the pear chunks in a large pot.
Cook the Pears: Add 3 cups of water to the pot and cook the pears over medium heat for 20-30 minutes, stirring occasionally until the pears soften and release their juice.
Extract the Juice: Use a fine mesh strainer or cheesecloth to strain the pear juice, pressing gently to extract as much liquid as possible. Discard the pulp or save it for another use. You should have about 4 cups of pear juice.
Make the Jelly: Return the juice to the pot. Add the sugar and lemon juice, stirring until the sugar dissolves. Bring the mixture to a boil and cook for about 10-15 minutes. Optionally, add pectin according to the package instructions for a firmer jelly.
Test the Jelly: To test if the jelly is ready, place a spoonful of the mixture on a chilled plate. After a few minutes, run your finger through it. If it wrinkles and holds its shape, it’s ready.
Can the Jelly: Pour the hot jelly into sterilized jars, leaving about half an inch of space at the top. Seal the jars and process them in a water bath for about 10 minutes to ensure they’re sealed properly.
Cool and Store: Let the jars cool completely before storing them in a cool, dark place. The jelly can be kept for up to a year if processed and sealed properly.