Trim ends from beans and discard. Place beans and tomatoes in Multipurpose Steamer. Grind salt and pepper on top, if desired. Cover and microwave on high until tender-crisp, 3–4 min.
Cut salmon into four pieces. Arrange over veggies; sprinkle with dip mix.
Cover and microwave on high until beans are tender and fish is cooked through, about 4 min.
Using the 2-in-1 Citrus Press, squeeze in juice from lemon.