Preheat the Oven: Preheat your oven to 325°F (163°C).
Season the Brisket: Season the brisket generously on all sides with salt and pepper.
Brown the Brisket: In a large roasting pan or Dutch oven, heat the olive oil over medium-high heat. Add the brisket and sear until browned on both sides, about 4 minutes per side. Remove the brisket and set aside.
Sauté the Aromatics: Reduce the heat to medium. Add the sliced onion and minced garlic to the pan, cooking until softened, about 5 minutes.
Deglaze: (Optional) Pour in the red wine, scraping up any browned bits from the bottom of the pan. Allow to reduce by half.
Add Tomatoes and Spices: Stir in the crushed tomatoes, beef broth, tomato paste, dried oregano, and dried thyme. Bring to a simmer.
Cook the Brisket: Return the brisket to the pan. Add lemon zest and juice, and olives. Cover tightly with a lid or aluminum foil. Transfer to the oven and cook for about 4 hours, or until the brisket is very tender.
Rest and Serve: Remove the brisket from the oven and let it rest for about 20 minutes before slicing against the grain. Serve slices of brisket with the sauce spooned over the top, garnished with chopped fresh parsley.