1.Preheat oven to 220°C (200°C fan-forced).
2.Combine redcurrant jelly, port and rosemary in a small saucepan and simmer, uncovered, for about 5 minutes or until the liquid is thickened slightly.
3.Place the carrots in a large baking dish, toss with combined oil and garlic. Place the corned beef on top of carrots and brush the beef with half of the redcurrant mixture. Bake for about 30 minutes or until the beef is browned all over and tender, brushing beef with remaining redcurrant mixture occasionally. Serve the beef with the carrots and a salad, if desired.