In medium saucepan over medium heat, stir marmalade until melted. Stir in beets and red pepper. Cook 3-5 minutes until liquid is reduced by about half, stirring frequently. Add ginger, if desired.
If using only cranberries, add to pan with beet mixture and cook until they just begin to pop. If also using other berries, add to beet-cranberry mixture; stir and heat through. If using only blueberries, raspberries or strawberries, add to beet mixture after reducing liquid. Stir and heat through.
Remove pan from heat; cool to room temperature before serving.