To make this a complete meal, try adding 250 grams of sliced Portabella mushrooms and 150 grams of walnuts. Note that the walnuts are roasted separately for the last five minutes and then tossed through the vegetables. Delicious and nutritious!
Rather than mixing in a bowl, I find it very convenient to put everything into a large kitchen bag and gently roll and shake until everything is coated. Same result, oil-free hands :)