3.

Whisking constantly, slowly add 1 1/2 cups of pasta cooking water to bowl with cheese mixture. Transfer cheese mixture to the now-empty pasta cooking pot, scraping the bottom to make sure you get everything. Cook over medium-high heat, stirring constantly with a rubber spatula, until mixture comes to a boil and thickens, about 45 seconds. Season sauce to taste with more salt and pepper as desired. Transfer pasta to sauce mixture and turn to coat. Just before serving, stir in more pasta water to thin sauce out as necessary. Serve immediately, sprinkled with minced herbs, black pepper, and cheese, and drizzled with additional olive oil.