Cut the tuna into thin strips or small cubes and dress very lightly with fresh lemon zest and juice; season to taste with salt and pepper.
With a small spoon remove the seeds and cut the cucumber into "half moon" pieces. Make a dressing of yogurt and dill; season to taste with salt and pepper and toss with cucumber "half moons". Make a little pile of lemon dressed smoked tuna in the center of each dinner plate and surround it with the yogurt dressed cucumbers.
Recipe Courtesy of �Michelle Urvater