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Put pieces of roast beef, tomatoes and arugula in a salad bowl. Drizzle the salad with olive oil and lemon juice. Salt, pepper to taste and gently mix, trying not to suppress the tomatoes. Pepper and salt the salad carefully, since usually roast beef is already quite saturated with spices along the outer edge. Therefore, first try what meat tastes like and based on this, add your spices.