Put the carrots in a saucepan and cover with water; bring to a boil over high heat. Cover, reduce heat to medium-low, and cook for about 15 minutes, or until just tender. Drain thoroughly.
Melt the butter in a large skillet over medium-low heat. Add the granulated sugar, orange zest, and salt. Add the cooked carrots and continue cooking until carrots are hot and glazed, stirring frequently.