Step 2: place beef in a large glass or ceramic dish. Add approximately 3/4 of the marinade. Turn to coat. Set aside for 10 minutes to marinate. Heat a greased chargrill or barbecue plate on medium heat. Cook, turning and brushing occasionally with remaining marinade for 15 minutes, for medium, or until cooked to your liking. Transfer to a plate. Cover with foil. Stand for 5 minutes. Slice thinly.
Step 4: meanwhile, place beans, capsicum, garlic, oil, lime juice and coriander in a bowl. Toss to combine. Season with salt and pepper.
Step 6: heat tortillas following packet directions. Divide beef evenly between tortillas. Top with spinach and bean mixture. Serve.