In a large bowl, stir together the coffee and maple syrup until syrup dissolves. Stir in the black pepper and salt.
Cut the beef into slices about 1/4 inch think and add to the marinade.
Cover the bowl and refrigerate 8 to 10 hrs.
When ready to dry the jerky,heat the oven to 200f line a rimmed baking sheet with foil,then set metal rack over it. Mist the rack with cooking spray. Remove the slices of jerky from the marinade,shaking them lightly to remove excess liquid. Arrange the slices on the prepared rack, leaving just enough space between them so they don't touch or overlap. Place the baking sheet on the ovens middle shelf. Leave for 3hrs. Once an hr rotate the pan front to back. After 3hrs check the jerky. It should be just barley tender. If not return to the oven for another 30 mins to a hr, checking regularly. Remove the pan from oven and let dry completely on the rack. Refrigerate in an air-tight container for up to 3 weeks. Let come to room temp before serving.