Clean and prepare the lettuce into bite size pieces and place in a large salad bowl. Add the red pepper and onion. This can be done ahead of time and stored in the fridge for a few hours. Then just before serving, add the oranges, cheese and a splash of oil and vinegar. Toss and serve.
If you want to make this into more of a main course, just add grilled chicken and it's perfect for light fare dinner menu!