Preheat oven to 425°F. Toss carrots with oil, coffee, salt, sugar, pepper, and, if desired, fennel pollen. Arrange in an even layer on a rimmed baking sheet. Roast at 425°F until browned and tender, 20 to 25 minutes, stirring halfway through cooking. Transfer to a platter, and sprinkle with parsley and lemon zest.