Pour 2/3 cup water into water reservoir and cover it. Assemble processing bowl and steaming basket. Place blueberries in steaming basket. Add slicing disc.
Slice pears into steaming basket on top of blueberries. Remove lid and slicing disc, then replace lid.
Steam until light turns off.
Remove steaming basket. Reserve steaming liquid from processing bowl for pureeing. Insert puree/chopping blade and place pears and blueberries in bowl. Blend, adding enough reserved liquid to reach desired consistency. Cool before serving.
Refrigerate remaining mixture or freeze in storage containers.