Bring a large saucepan of salted water to a boil. Add lima beans and cook; stirring occasionally, until tender, about 4 minutes. Drain, rinse with cold water, then drain again, and pat dry with paper towels.
Transfer lima beans to a bowl.
Stir in oil, lemon zest and lemon juice; season with salt and pepper.
Divide among four serving plates and sprinkle with Parmesan.