1. Bring 8 cups of water to a boil in a large saucepan. Cook broccoli rabe in boiling water 2 minutes; drain.
2. Heat a large nonstick skillet over medium heat. Add peanut oil to pan; swirl to coat. Add crushed red pepper and garlic to pan; cook 30 seconds, stirring occasionally. Add broccoli rabe to pan; cook 2 minutes. Stir in salt and black pepper.
2. Gently toss sautéed rabe in soy sauce, rice wine vinegar, sugar, and sesame oil. Sprinkle with sesame seeds.