Make the dressing by beating the oil in a thin trickle through the other ingredients, except the beans and walnuts. Bring a large pan with salted water to a boil. Blanch the beans for approx. 5 minutes, until cooked al dente.
Drain in a colander over the sink. Toast the nuts briefly in a dry frying pan.
Place the beans in a serving dish, top with the dressing and sprinkle with walnuts.
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