Add garlic and onion and sweat. Add ground beef, seasonings, and simmer until meat is halfway done. Remove off heat. (Do parallel to step 2) In a small pot add rice and 1 to 1.5 cups of water. Cook on medium until rice is cooked halfway. Meanwhile, take the baking pan out of the oven and set aside. (Keep the oven on.)
In a medium pan or cast iron skillet over medium-high heat, heat it until very hot, about 3 – 4 minutes. Lightly brush with a layer of vegetable oil. Add beef and cook until just a little pink left. Season lightly with salt. Add the rest of the garlic and saute for another minute.
In a large skillet, melt butter over medium-high heat. Brown beef. Add broth and garlic. Simmer, covered, for 30 minutes. Add green peppers and onion. Cover and continue to simmer for 5 minutes. Combine cornstarch, soy sauce and water; stir into meat mixture. Cook and stir until thickened.