In a saucepan, bring 1 in. of water to a boil; place carrots in a steamer basket over water. Cover and steam for 8-10 minutes or until crisp-tender. Drain pineapple, reserving juice; set pineapple aside.
In a saucepan, combine cornstarch and cinnamon. Add the brown sugar, butter and reserved juice. Bring to a boil; cook and stir for 2 minutes or until thickened. Stir in the carrots and pineapple; heat through.