Heat a large, thick bottomed griddle pan or frying pan over medium heat.
Brush the courgette slices with olive oil, sprinkle with a little salt and fry, in batches, until charred, but not completely soft. Leave to cool.
At the same time, cook the pasta in plenty of salty water until tender, 6–8 minutes or longer. Drain and rinse with cold water until completely cooled. Drain and set aside.
Mix all the dressing ingredients well. Season to taste with salt and pepper.
Cut the griddled courgette slices into large chunks. Mix with the pasta, roast peppers, feta cheese and walnuts. Add the dressing and mix again. Season to taste with more salt, pepper or lemon juice, if necessary.
Just before serving, mix in the herbs.
