Cut the beef brisket into cubes.
Season the brisket cubes with salt and pepper.
Drizzle olive oil in a pan and preheat.
Sear the brisket cubes on high heat just until the outside is browned quickly.
Add onion and garlic, and sauté together.
Add butter to taste if desired.
Once the meat is cooked through, turn off the heat and it's ready to serve.