Cut beef into stripes, making sure to cut along the grain. Grind garlic, ginger and grains of paradise together, and marinate beef strips in the mixture with salt for about 15-30 minutes or more.
Heat oil in a wok, add the beef strips, cook till its all cooked through.
Add the soy sauce, bell pepper and onions and stir fry for about a minute or two. Serve with boiled rice.
Cut beef along the grain: watch the beef closely, you will notice the meat has patterns in one direction. Cutting along the grain ensures the meat is tender, marinating longer also helps the meat to tenderise.