In a bowl, mix the lemon zest with all the other ingredients up to and including the salt.
Heat the oil in a non-stick frying pan. Stir fry the green beans for approx. 1 min. Pour in the water and simmer gently for approx. 8 mins. Add the courgette, cook for a further 2 mins., season with salt. Mix the vegetables with the dressing.
Divide the lettuce into bowls. Add the bean salad, feta, nuts and berries.