Bring a large pot of salted water to a boil. Add the spaghetti and cook until al dente. Mine was about 10 minutes. Reserve a cup of pasta water and then drain the pasta.
In a large skillet, add the olive oil over medium-high heat. Once hot, add the garlic and let it sizzle in the oil. Add tomato paste, chili flakes and salt. Stir gently to combine until the tomato paste melts down into the garlic. Shake the pan a bit back and forth (careful not to splash yourself) and cook the garlic like this for 2-3 minutes, but DO NOT LET IT BURN. Light brown is ok, but once garlic gets too brown or burnt, it gets bitter.
Add the pasta right to the pan. Toss with tongs to coat the spaghetti in the silky, oil/garlic mixture.
Turn off the heat and add the parsley, parmesan, and a bit of pasta water. Toss again with tongs to coat all the beautiful strands.
Right before serving, give a squeeze of fresh lemon over the top. Taste for perfection, and season with more salt if needed. Then, curl up with it on the couch and enjoy. Cheers.
