Toast the walnuts in a pan without any oil for approx. 5 mins. over a medium heat and leave to cool. Mix together the walnuts, parsley and oil, and season.
Toast the baguette slices for approx. 3 mins. in the centre of an oven preheated to 220°C. Distribute the goat's cheese over the slices of bread and gratinate for approx. 5 mins. in the middle of the oven. Allow to cool a little, top with the nut pesto and serve immediately.