Use a medium-large saucepan with a steamer attachment. Pour enough water into the saucepan and fill it up to one-third of the saucepan. Place the saucepan over high heat and bring it to a rapid boil. Place the pears into the steamer attachment. Carefully place the steamer on top of the saucepan and cover. Steam the pears for 10 minutes, then add in the prunes and steam for another 2 minutes or until pears have completely softened. Remove the fruits from the steamer and place them in a bowl to cool off for 10 minutes.
Transfer the fruits into a blender or food processor and pulse until the mixture turns into a purée. Add a few tablespoons of water if the consistency of the purée is too thick and blend again.
Notes
NOTE 1: Pears, I usually buy 'Beurre Bosc' or 'Packham' pears but any type of pears will work. You don't have to peel the skin prior to cooking, but you can if you wish. Chop the pears roughly into chunks and discard the core.NOTE 2: Prunes are available in the dried fruit section of the supermarket. Most brands of prunes come pitted, but still take care, as I've found seeds in Kai' puree before.Leftovers - Allow the purée to cool completely at room temperature. Transfer the puree into an airtight container and refrigerate, it'll be good for up to 3 days. Frozen purée will keep for up to 3 months.