I learned from various websites that corned beef can be very salty, especially when baked. To remedy this, place the corned beef in a large pot of boiling water and boil it over high heat for 1 minute. Drain the water and pat the corned beef until very dry.
Preheat the oven to 375 degrees. Line a baking sheet with foil for easier cleanup.
Brush a thick coating of Dijon mustard over the entire piece of beef. Place the fat side up on a large piece of foil.
Next, sprinkle the brown sugar over it.
Wrap the corned beef with foil so that space is left between the top of the corned beef and the foil.
Wrap in a second piece of foil.
Place into the oven and bake for 3 hours.
Open the foil and broil the corned beef for 2-3 minutes, until the top is bubbly and lightly browned.
Watch it carefully so it doesn’t burn.
Let the corned beef rest for at least 10 minutes before slicing against the grain of the meat.
Serve with the reserved extra Dijon mustard on the side if desired. Enjoy!