Clean the clams: Rinse and scrub under cold water. Soak in salted water for 20–30 minutes to purge sand. Rinse again.
Sauté garlic: In a large pan, heat butter and olive oil over medium heat. Add garlic and cook for 1–2 minutes until fragrant.
Add clams: Pour in the broth and stir. Add clams to the pan and cover with a lid.
Steam: Cook for 5–7 minutes until most clams open. Discard any that stay closed.
Finish: Squeeze in lemon juice. Add chopped parsley, salt, pepper, and optional red pepper flakes.
Serve hot with crusty bread or over pasta.