Core and cut apples into quarters with the skin and thinly slice and sprinkle a little lemon juice and mix lightly.
Peel cucumbers and cut into one-inch long pieces. Peel the orange and discard the seeds and pith.
Cut the segments into two. Sprinkle mushroom slices with some lemon juice to prevent discolouring.
Trim the lettuce leaves, wash in flowing water and soak in chilled water, to keep them fresh and crisp.
Mix the remaining lemon juice, salad oil, red chilli flakes, chopped coriander and mint leaves. Add salt to taste.
Whisk well. Drain the lettuce leaves and tear them into bite sized pieces.
Make a bed of these leaves on the serving dish. Lace with one-fourth part of the dressing.
Combine apples, orange segments, mushrooms, carrot, tomatoes and spring onions. Toss them in the remaining dressing and place it on the lettuce bed. Serve immediately.