Warm 2 tablespoons olive oil in a 10-inch saucepan or deep skillet over medium heat. Add 3 medium, thinly sliced zucchini, 4 thinly sliced scallions, 4 thinly sliced garlic cloves, 1 teaspoon kosher salt, 1/4 teaspoon freshly ground black pepper, and the ZEST ONLY (not juice yet!) of 1 lemon.
Cook for 15 to 20 minutes, stirring every few minutes, until the zucchini is very soft.
Pour in 2 1/2 cups vegetable stock, scrape up any bits that are stuck to the bottom of the pan, and bring to a boil over high heat. Stir in 8 ounces pasta. The water might not cover the pasta depending on the size of your pot - that’s OK!
Reduce heat to medium and simmer uncovered, stirring often, for 12 to 15 minutes or until the pasta is cooked and all but 1/4 cup or so of the liquid has evaporated.
Depending on the size of the pot you use, it may take more or less time for the liquid to evaporate - if the liquid evaporates before the pasta is cooked, add another ¼ cup of water and keep cooking.
Remove the pot from heat once the pasta is tender. Stir in 1/2 cup Parmesan cheese, 1/2 cup basil leaves, and the juice from the zested lemon.
Taste and season with additional kosher salt as needed.
Serve immediately, garnished with more basil, a drizzle of olive oil, and freshly ground black pepper.