Green beans, mushrooms and cucumber salad

Ingredients
8 oz green beans (French beans)
8 oz of mushrooms, thinly sliced
1 small cucumber
1 tablespoon of olive oil
1 chopped garlic clove
1 lemon
salt, black pepper

Method
Cook the green beans. (Steam in a microwave oven for 5 minutes, or boil in no more than a cup of water for 7 - 8 minutes) The beans should be slightly crisp. Drain off the water and season with a some of the olive oil and some of the juice of the lemon. Allow to cool.
Chop the cucumber into 1 cm squares, and mix with the sliced mushrooms, adding the garlic, the rest of the oil and the lemon juice.
Put the green beans into a shallow serving dish, then put the mushroom mixture on top, adding salt and freshly ground black pepper.

(from Elizabeth David, Summer Cooking, first published in 1955)