1. Bring a large pot of water to a boil. Cook orzo according to package directions, adding broccoli rabe 3 minutes before the orzo is done. Drain well.
2. Heat oil in a pot over medium heat. Add garlic and cook, stirring, until fragrant (30 seconds).
3. Add oregano, salt, pepper, and the orzo mix. Cook, stirring, until heated through (2 minutes).
4. Remove from the heat. Stir in feta and lemon juice to serve.