Cook pasta until al dente, drain, rinse under cold water until chilled, drain well.
Drop broccoli florets into boiling salted water and cook for 2 minutes. Drain and rinse under cold water to stop the cooking; drain well again. Flake the tuna.
Combine with pasta, broccoli and pepper. Blend in dressing and remaining ingredients.
Season to taste with salt and pepper.
Caper dressing :
Combine all ingredients in a mixing bowl. Stir to blend