Preheat your oven to 300°F (150°C).
In a small bowl, combine the smoked paprika, garlic powder, sea salt, and black pepper to create a dry rub.
Rub the spice mixture evenly over all sides of the beef brisket.
Place the brisket in a roasting pan, cover tightly with aluminum foil to lock in moisture, and roast for 3 to 4 hours until the meat is fork-tender.
While the brisket rests after roasting, heat the ghee in a large skillet over medium-low heat.
Add the thinly sliced yellow onion to the skillet and cook slowly for 20-25 minutes, stirring occasionally, until the onions are deeply caramelized and golden brown.
Stir in the apple cider vinegar to deglaze the pan, scraping up any flavorful browned bits.
Steam the green beans for 5-7 minutes until they are tender-crisp and vibrant green.
Slice the rested brisket against the grain and serve topped with the caramelized onions alongside the steamed green beans.