Young, tender string beans may be substituted for the French beans.
In a small bowl, combine juices, soy sauce, coriander, ginger, and honey. Whisk in oil and season to taste with salt and pepper.
Bring a pot of water to a boil. Add 1 teaspoon salt and beans; cook until tender, about 2 minutes. Drain beans, then cool in ice water.
Slice tomatoes 3/4 inch thick, and cut slices into chunks. Drain beans well and place in a bowl with tomatoes and arugula. Season with salt and pepper and toss with dressing. Arrange on 4 salad plates.