01 - Bring a large pot of generously salted water to a rolling boil. Cook the pasta until it reaches an al dente texture, following package directions. Before draining, reserve approximately 1/2 cup of the starchy pasta water, then drain the pasta thoroughly.
02 - While the pasta is cooking, in a medium mixing bowl, combine the ricotta cheese, 1 tablespoon of the lemon zest, the fresh lemon juice, finely grated Parmesan cheese, extra-virgin olive oil, and a generous pinch of freshly ground black pepper. Whisk until the mixture is thoroughly blended and achieves a smooth, creamy consistency.
03 - In a large skillet, melt the unsalted butter over low heat. Add the drained pasta to the skillet and toss gently to ensure each strand is lightly coated with the melted butter.
04 - Remove the skillet from the heat. Add the prepared ricotta mixture to the pasta. Toss to coat, gradually incorporating the reserved pasta water, a tablespoon at a time, until a silky sauce forms that beautifully coats the pasta.
05 - Divide the sauced pasta among individual serving bowls. Artfully top each portion with a spoonful of lemon zest caviar, a sprinkle of the remaining reserved lemon zest, and a scattering of freshly chopped herbs.
06 - Serve immediately. Offer additional grated Parmesan cheese and freshly ground black pepper at the table, if desired.