Here's my first meal of the challenge :)
Of the other 50% of the plate, half of that should be filled with complex carbohydrates (this is where starchy veggies like potato and sweet potato come in as well as brown rice, wholemeal pasta, quinoa, whole grains) and the other half with lean protein (steamed fish, chicken/turkey breast, lean red meat etc). A small amount of healthy fat is important too. If you're not having oily fish with the meal, try and add a small amount of avocado, olive oil or fresh, unsalted nuts.
This will help you easily reach your "5 a day" of veggies, give you lots of energy and help keep that waistline trim!