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 thoroughly.
02 - While the pasta cooks, add the wild garlic leaves, toasted pine nuts, grated Parmesan, and garlic clove to a food processor. Pulse several times until the ingredients are roughly chopped and combined.
03 - With the processor running continuously, slowly drizzle in the olive oil until a smooth, vibrant green paste forms. Add the lemon juice and season with salt and black pepper to taste. Pulse once more to incorporate.
04 - Transfer the drained pasta back to the pot or to a large serving bowl. Add the wild garlic pesto and toss well to coat every strand. Splash in the reserved pasta water a little at a time until the sauce reaches a silky, clinging consistency.
05 - Divide among warmed plates or bowls. Finish with an extra shower of grated Parmesan and a generous crack of black pepper, if desired. Serve immediately while hot.