Heat the olive oil in a frying pan and add the mushrooms. Cook for about three minutes until starting to brown. Set aside to cool.
In a large bowl, mix together all the ingredients for the salad. Add the mushrooms.
In a jar, mix together all the ingredients for the dressing, and shake well.
Pour the dressing over the vegetables and mix together well. Sprinkle over the peanuts, sesame seeds and cress to serve.