To make the dressing, whisk the oil and lemon juice in a bowl and season with a good pinch of salt and pepper. Add the spring onions and set aside for 5 minutes to take the rawness out of the spring onions.
Put half the chopped walnuts in a large mixing bowl and crumble in half the feta. Pour over the dressing, chuck in the green chilli, tarragon, parsley and m