In a medium saucepan, combine all the ingredients, except for the pear. Bring the mixture up to a boil, stirring every so often with a wooden spoon.
Reduce to low and let the pudding simmer until it is thick, about 10 minutes. Be sure to stir more often towards the end of the cooking time, when the pudding is thick.
Divide the pudding and serve in 4 bowls. Top each with a slice of poached (or canned) pear, chopped crystallized ginger, and a sprinkle of maple flakes. Serve warm.
Notes
You should easily find Calrose rice at most grocery stores, but you can also order it online from Amazon.