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Bring a large pot of salted water to a boil. (TIP: Cover pot with a lid to boil water faster.) Wash and dry produce.
Trim and halve zucchini lengthwise; thinly slice into half-moons. Trim and thinly slice scallions, separating whites from greens. Quarter lemon.
Rinse shrimp under cold water, then pat dry with paper towels. Open package of chicken and drain off any excess liquid. Season all over with salt and pepper. Heat a large drizzle of oil in a large pan over medium-high heat. Add shrimp or chicken and cook, stirring occasionally, until cooked through, 4-6 minutes. Turn off heat; transfer to a plate. Wipe out pan.