1Place 1/2 chopped onion, 2 cloves garlic, parsley, oregano, paprika, anise seed, black pepper, cumin, sage, thyme, bay leaves, cloves, soy sauce, vinegar, orange juice, and lime juice in a blender; pulse until a very well-blended paste is achieved, scraping down sides as needed, 3 to 5 minutes. Spread paste on both sides of the flank steak. Wrap steak in plastic and refrigerate at least 6 hours to overnight.
3Grill steak until it begins to firm and is hot and slightly pink in the center, about 8 minutes per side. An instant-read thermometer inserted into the center should read 140 degrees F (60 degrees C). Chop steak into small pieces and transfer to a platter; cover and keep warm until ready to serve.
