Trim all silver skin and visible fat from the beef fillet, then cut the fillet into large chunks suitable for the food processor.
Place the beef chunks into the food processor.
Add the cayenne pepper, salt, anchovy paste, garlic powder, and ground cardamom to the processor with the beef.
Pulse the mixture until the beef reaches your desired texture—about 1/4-inch coarse pieces for a chunkier kitfo or pulse longer for a finer, ground texture.
Melt the clarified butter or ghee in a small saucepan, then pour it over the processed beef.
Use your hands or a spatula to mix the melted butter into the beef until evenly distributed; do not pulse in the processor.
Serve the kitfo raw immediately, or cover and chill; alternatively, pan-fry portions over high heat for 1–2 minutes if you prefer it cooked.