Arrange potato and green beans on one side of a steamer basket over boiling water in a Dutch oven. Place tuna on opposite side of basket. Cover and steam 8 to 10 minutes or until fish flakes easily when tested with a fork. Set tuna aside to cool. Plunge steamed potato and green beans into ice water to cool.
While tuna and vegetables steam, combine vinegar, lemon juice, and mustard in a jar; cover tightly, and shake vigorously.
Place lettuce on a serving platter. Drain potato and beans; arrange over lettuce. Flake tuna, and place on salad; add tomato wedges. Drizzle with vinegar mixture. Sprinkle with freshly ground black pepper.
501 Delicious Heart Healthy Recipes
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