In a bowl, toss beef, onions, bell peppers, chili flakes (optional), salt, and pepper.
Skewer ingredients firmly onto the spit of the Rotisserie Skewer: in order, beef, bell peppers, onions, alternating each piece. Position Rotisserie Skewer into Brio, placing one end of Skewer into Hole and other into Bracket. See “Rotisserie Skewer Assembly” under Assembly Guide for more.