Cut squash in half and scoop out the seeds. Bake the two halves face-down at 400° for 45 minutes, or until very soft.
Scoop out the cooked squash from the skin and place in a blender or food processor with about a cup of water. Blend until smooth.
Add blended squash to a large saucepan with the rest of the ingredients and cook over medium, stirring constantly and scraping the bottom of the pot to prevent sticking. When it just starts to bubble, turn it off.
Stir in rice dumplings and serve with sesame seeds and chopped pecans.