Preheat oven to 400°F (200°C).
Trim leeks and slice into 1-inch rounds. Rinse between layers and pat dry.
Whisk together olive oil, Parmesan, lemon juice, garlic, honey and spices.
Arrange leeks in a single layer in a baking dish. Pour marinade over top and sprinkle with extra Parmesan.
Cover with foil and bake for 30–40 minutes, until tender.
Uncover, add more Parmesan and bake for another 5 minutes, until golden. Broil briefly if needed for extra crispiness, watching closely.
Serve warm with the delicious Parmesan-lemon sauce spooned over top!
