• 2 tbsp. finely chopped Italian parsley
Place the corned beef, along with any pickling spices that come with it, in a pot and cover with cold water. Bring to a boil and then reduce the heat to a low simmer and cook for about 4 hours or until fork-tender. (Think about 1 hour for each pound.) Remove from the pot, drain and place on a baking sheet. Reserve the broth.
Meanwhile, heat the oil and butter in a large skillet on medium heat. Add the leeks and saute about 7 to 10 minutes, or until nicely softened and lightly browned. Add the cabbage and toss with the leeks, cover and cook for about 10 more minutes or until starting to soften.
Remove the cover, turn up the heat to medium-high and continue cooking until the cabbage is wilted and beginning to caramelize. Add salt and pepper, about 1/2 cup of the corned beef broth and cook until the cabbage is moist but no liquid remains. Season to taste. Reserve. (If making in advance, refrigerate the corned beef until cool and then cover and refrigerate until ready to reheat. Also cool the cabbage, cover and refrigerate. Gently reheat just before serving. Remember to keep the reserved broth because you will need it.)
Preheat the oven to 375 degrees.