01 - In a large bowl, whisk together olive oil, lemon juice, oregano, smoked paprika, minced garlic, salt, and black pepper.
02 - Add the beef cubes to the marinade and toss until fully coated. Cover and refrigerate for at least 15 minutes or up to 2 hours for enhanced flavor.
03 - Heat a grill or grill pan to medium-high. If using wooden skewers, soak them in water for 20 minutes to prevent burning.
04 - Thread beef, bell peppers, and red onion pieces alternately onto the skewers.
05 - Cook the skewers on the grill for 10 to 12 minutes, turning occasionally, until beef reaches desired doneness and vegetables are lightly charred.
06 - Transfer kebabs to a platter. Garnish with fresh parsley and serve alongside lemon wedges.