01 - Bring a large pot of generously salted water to a rolling boil. Add the pasta and cook according to package directions until al dente. Before draining, reserve ½ cup of the starchy pasta water. Drain the pasta through a colander.
02 - While the pasta cooks, combine the wild garlic leaves, pine nuts, Parmesan, olive oil, garlic clove (if using), lemon juice, and a generous pinch each of salt and pepper in a food processor or blender. Blend until a smooth, vibrant green paste forms, scraping down the sides as needed. Taste and adjust the seasoning with additional salt, pepper, or lemon juice.
03 - Return the drained pasta to the pot. Immediately spoon the wild garlic pesto over the hot pasta and toss vigorously to coat every strand evenly. Add splashes of the reserved pasta water as needed to loosen the pesto into a silky, clinging sauce.
04 - Divide the pasta among warmed serving bowls. Finish with an extra shower of grated Parmesan and a scattering of wild garlic leaves or edible flowers if desired. Serve without delay while the pasta is hot and the flavors are at their peak.