Fill an eight-quart pot with water and bring to a boil. Carefully drop in the corned beef and bring to boil once again. Lower heat and cook 35–40 minutes per pound of meat (1 hour and 15 minutes for every 2 pounds). Taste a small piece of meat when cooking time is up to see if it’s soft enough. If not, cook a little longer. If it’s ready, drain but retain some of the water for reheating. Set aside to cool.

Meanwhile, prepare glaze: Place all glaze ingredients, aside from oil, in a small saucepan. Whisk together over high heat, bringing to a boil. Reduce heat to low and simmer 10 minutes or until thickened. Stir occasionally. Remove from heat and add oil. Stir until mixed in. This will give the glaze a nice shine.

Cool slightly and smear on corned beef, coating the top evenly. Place in a roasting pan in a preheated 350 degrees Fahrenheit (180 degrees Celsius) oven and cook covered for half an hour. You might want to pour some of the reserved water on the bottom of the pan so it doesn’t dry out.

Cool completely before refrigerating. Slice when cold.