Prepare the Bacon:

1. Cut bacon into strips or cubes.
2. Sautee in a saucepan or a large skillet with a drizzle of water on medium heat until the water evaporates.
3. Reduce heat to low and continue cooking while you go through the next steps, stirring occasionally.

Start the Pasta Water & Make the Creamy Pesto:

1. Fill a large pot with water and place on high heat to bring to a boil.
2. While the pasta water is heating, rinse arugula and add to a food processor.
3. Include one peeled, crushed garlic clove, a pinch of coarse salt, and 2 tablespoons of extra-virgin olive oil. Blend until smooth.
4. Add grated cheese, walnuts, and the rest of the oil to the processor. If the pesto is too thick, adjust with a little water. Blend again.

Cook Pasta:

1. Add 1-2 tablespoons of coarse salt to boiling water, then add pasta.
2. Cook on low heat according to package instructions.

Combine Pesto with Bacon (as pasta cooks):

1. Add the prepared pesto to the saucepan with the cooked bacon.
2. Stir over low heat for 8-9 minutes. If desired, incorporate milk and chili flakes towards the end of cooking.

Finish the Pasta:

1. Once the pasta is al dente, strain it.
2. Combine the cooked pasta with the bacon and pesto mixture in a bowl or directly in the saucepan, depending on size.
3. Serve the combined pasta, bacon, and pesto with additional grated Parmesan cheese on top.