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Bring a small pot of water to a boil. Wash and dry produce.
Halve, core, and thinly slice poblano into strips. Drain and rinse beans. Zest and quarter lime. Trim and discard root end from lettuce; chop into bite-size pieces until you have about 4 loose cups (8 loose cups for 4 servings). Dice tomato into ΒΌ-inch pieces.