1. Place the 3 peeled and pitted peaches in container of an electric blender; process until smooth, stopping once to scrape down sides.
2. Pour puree into a medium saucepan. Stir in sugar, orange juice, and jam; bring just to a boil over medium heat, stirring constantly.
3. Stir in 1 cup peach slices, Triple Sec, and brandy.
4. Serve warm over ice cream or pound cake.