Cook pasta according to package directions until al dente. Reserve at least ½ cup of the pasta water before draining.
While the pasta is cooking, heat a tablespoon of olive oil in a medium skillet over medium heat. Add the garlic scapes and cook for 7 to 9 minutes, stirring occasionally, until tender and lightly browned. Stir in the butter and a tablespoon of the lemon juice.
Place the drained spaghetti and cooked garlic scapes back into the pot that you used to cook the pasta. Stir in the rest of the olive oil and lemon juice, lemon zest, parmesan cheese, salt, and pepper. Add splashes of pasta water as needed to thin the sauce to your desired consistency. Taste, and adjust seasonings as desired.
Serve with more cheese, lemon zest, and a crack of black pepper.
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Notes
Store leftovers in an airtight container in the fridge for 2 to 3 days. Reheat in a skillet with little olive oil and lemon juice to freshen up the dish.
Omit the cheese to make vegan.
Use lentil spaghetti or another legume-based pasta for more protein or to make gluten free.