Add 1 tablespoon of olive oil to a large pot (large enough for the pasta to fit in also), over medium heat. Once hot, add the sausage and cook and crumble until browned and cooked through, about 10 minutes.
Once the sausage is fully cooked, add the pasta, sliced garlic, half of the olive oil, salt, and 4½ cups of water to the pot with the sausage. Bring the ingredients to a boil.
Reduce the heat to medium and set a timer for 10 minutes. Stir the pasta occasionally as it cooks to keep it from sticking to the bottom of the pot.
After the 10 minutes is up, stir in the kale and lemon juice, and let everything cook for an additional 2-3 minutes, until the pasta is al dente and a thick sauce has formed, then remove from heat.
Finally, add the olive oil, parmesan cheese, red pepper flakes, and capers to the pasta and toss to combine. Serve and enjoy!