Place peanuts in a food processor; process until finely chopped. Add paprika, onion powder, ginger, pepper flakes and garlic powder; pulse until combined., Place beef in a large bowl or shallow dish. Drizzle with oil; sprinkle with salt. Toss to coat. Add peanut mixture; turn to coat. Refrigerate, covered, for 2 hours. Drain beef, discarding marinade., Thread beef onto metal or soaked wooden skewers. Grill, covered, over medium-high heat until beef reaches desired doneness, 10-15 minutes, turning occasionally. Serve with onion, tomato and cilantro.