Salad Boil, steam or microwave the beans and potatoes separately until just done. Rinse in cold water and drain. Heat the oil in a pan and fry the potato slices in batches until crisp and brown. Drain on paper towels. Cut the tuna into 2 cm thick steaks and cut each steak into 4 pieces. Sear the tuna for about 30 seconds on each side in a very hot griddle pan. Arrange the tuna, beans, potatoes, onion, tomatoes and watercress on a large salad platter. Sprinkle the olives on top and drizzle with the dressing.
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