The trick with this recipe is to make the sauce ahead, then time the pasta and scallops so they are done at the same time. Depending on the type of pasta you're using it will take different amounts of time, so I'll leave it to your discretion as to when to start the pasta.
For the sauce, heat the 1 teaspoon olive oil in a pan. Sauté the 1 small spring onion until soft and starting to caramelize. Add the ½ cup dry white wine and 1 tablespoon lemon juice and reduce until thick and gluggy. Whisk in the ½ cup heavy cream and 1 teaspoon Pernod and turn down the heat to keep it warm.
Clean and dry the ½ pound dry bay scallops. Heat a non-teflon pan over high heat until hot. Lightly salt and pepper the scallops. Add the 1 tablespoon cultured unsalted butter to the pan and swirl to melt. When the bubbling subsides add the scallops in a single layer without overcrowding the pan. Sear undisturbed until brown, then flip with tongs. Cook until the top ⅓ and bottom ⅓ of the scallop is opaque and the middle ⅓ is still translucent.
Transfer the scallops to a plate, then add the cream sauce to the pan that the scallops came out of and deglaze. All that brown fond on the pan adds umami to the sauce. Add the ¼ cup basil to the sauce, then put the drained 220 grams pasta in the sauce and stir to coat.
Plate the pasta then top with the scallops and drizzle any remaining sauce on top.