Preheat the oven to 400 degrees . Grease a rimmed baking sheet. In a bowl, whisk together 1 tbsp. brown sugar, the lemon juice and cinnamon. Add the pears; toss until coated. Arrange the pears on the baking sheet; roast until tender, about 15 minutes. Cool slightly; cut into 1/2-inch cubes.
Meanwhile, in a medium saucepan, bring the remaining ingredients and 5 tbsp. brown sugar to a boil; simmer for 5 minutes. Transfer to a bowl.
Stir the pears into the bowl and let cool to room temperature. Cover and refrigerate until chilled.