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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.
Pat chicken dry with paper towels and season all over with salt and pepper. Heat a drizzle of oil in a large pan over medium-high heat. Add chicken or sausage; cook, stirring frequently, until browned and cooked through, 4-6 minutes. Turn off heat; transfer to a plate. Wipe out pan.