Drain pineapple, reserving juice; dip banana slices in juice. Place pineapple juice, oil, vinegar, sesame seeds, honey, salt, pepper, and mustard in screw-top bottle or jar; close and shake vigorously until blended.
Arrange fruit and melon on lettuce-lined dishes and serve with dressing. Garnish with strawberries and citrus slices. Makes 6 servings.
Variation: Substitute 1/4 teaspoon ground ginger for sesame seeds.