In a large bag combine the Brisket, the onion soup mix, and the apple butter. Move the bag around so the butter and onion soup covers the entire brisket. Let it marinate overnight (optional)
Preheat oven to 350 Degrees F.
Season the beef with salt and Pepper
In a large skillet, heat 1 tablespoon of olive oil over medium-high heat. Add the meat and marinade and let it brown on both sides for about 4-5 minutes on each side
Remove Brisket from heat and place on a large baking dish
Lower the heat to medium, using the same skillet add another tablespoon of oil and cook the onions until they soften up (about 5 minutes)
Add in the chopped garlic and let it cook for 1-2 minutes more. Be careful not to burn the garlic
With a wooden spoon scrape the bottom of the skillet to release the browned pieces of meat
Add the beer and stock to the onions and let it come to a boil
Empty the sauce on top of the beef in the baking dish and move it around so the entire sauce has spread on top and at the bottom of the Brisket. Cover with foil
Roast in the oven for at least 2:30 to 3 hours. Turning the beef once. Be careful that the sauce doesn’t dry up. Meat should be tender.
Remove from oven and slice it thinly against the grain. Top with sauce and garnish with chopped parsley