01 - Bring a large pot of salted water to a boil. Add the green beans and cook for 3–4 minutes until crisp-tender. Drain and immediately plunge into ice water to stop the cooking. Drain again and set aside.
02 - In a large skillet, heat olive oil over medium heat. Add the garlic and sauté for 1 minute until fragrant, but not browned.
03 - Add the blanched green beans to the skillet. Season with salt and pepper. Sauté, stirring often, for 3–4 minutes until heated through and just starting to brown in spots.
04 - Remove from heat. Add lemon zest and lemon juice, tossing well to coat.
05 - Transfer to a serving platter. Sprinkle with fresh parsley, if desired. Serve warm or at room temperature.