Northumberland Grassfed Beef Jerky. We are committed to providing our customers with the highest quality, best tasting jerky possible. Our beef comes from pasture-raised native breeds that are grass-fed on Northumbrian farms. The meat is hand-sliced nice and thick before being smothered in marinade and left for at least 18 hours to fully absorb all the flavours. It is then slowly air-dried for 10 hours which gives our jerky its satisfying bite and chew.