Creating Garlicky Black Walnut-Breadcrumb Pasta is straightforward if you follow these simple steps:

1. Cook Pasta: In a large pot, bring salted water to a boil. Add the spaghetti and cook according to package instructions until al dente. Drain and reserve about 1 cup of pasta water.
2. Prepare Walnuts: In a skillet over medium heat, add the chopped black walnuts. Toast them for about 5 minutes or until fragrant. Remove from the pan and set aside.
3. Melt Butter: In the same skillet, lower the heat and add the butter. Let it melt and start to foam.
4. Add Garlic: Stir in the minced garlic and cook until fragrant, about 1-2 minutes. Be careful not to let it burn.
5. Combine Breadcrumbs: Add the breadcrumbs to the skillet along with the red pepper flakes, salt, and pepper. Stir to combine, allowing the breadcrumbs to become golden brown, about 3-4 minutes.
6. Merge Pasta and Sauce: Add the drained pasta to the skillet. Toss well to coat the pasta in the garlic-butter mixture.
7. Adjust Texture: If the pasta seems dry, gradually add a bit of the reserved pasta water until desired consistency is reached.
8. Finish with Walnuts and Cheese: Stir in the toasted black walnuts, Parmesan cheese, and lemon juice. Toss until well combined.
9. Garnish and Serve: Remove from heat and garnish with fresh parsley for a vibrant touch.

Following these steps will guide you to create a fantastic dish that showcases the incredible flavors of Garlicky Black Walnut-Breadcrumb Pasta.