To prepare brittle, line a baking sheet with foil; coat the foil with cooking spray.
Combine granulated sugar and 1/4 cup water in a small saucepan over medium-high heat. Cook until sugar dissolves, stirring gently to dissolve sugar evenly. Cook 4 minutes or until golden (do not stir). Remove from heat; carefully stir in sesame seeds. Rapidly spread mixture onto prepared baking sheet. Cool completely; break into small pieces.
To prepare sake cream, combine sake, butter, brown sugar, and salt in a medium saucepan over medium-high heat; bring to a boil. Cook until reduced to 1/4 cup (about 4 minutes). Remove from heat; stir in cream. Gently stir in orange segments. Serve over ice cream; sprinkle with brittle.