Prepare the Clams: Scrub the clams under cold water to remove any dirt or grit. Tap any open clams to see if they close; discard any that remain open.
Sauté the Garlic: Heat olive oil in a large skillet or Dutch oven over medium heat. Add the garlic and sauté until fragrant (about 1-2 minutes).
Cook the Clams: Add white wine to the skillet and bring to a simmer. Add the clams, cover, and cook for 5-7 minutes, shaking the pan occasionally. Discard any clams that don’t open.
Add the Tomatoes: Stir in the diced tomatoes, red pepper flakes (if using), salt, and pepper. Simmer for another 5-7 minutes until the sauce thickens slightly.
Finish and Serve: Stir in fresh parsley and squeeze a little lemon juice over the dish. Serve with crusty bread to soak up the sauce.