Basil pesto: add the basil leaves, pistachio nuts, garlic and parmesan cheese to the food processor. Blitz to combine and then remove the lid and scrape the insides of the bowl down to the bottom. Next drizzle in the olive oil and lemon juice. Blitz again to combine. Once the pesto has come together, use a spatula to transfer it to a small bowl and place it into the fridge whilst you prepare the rest of the dish.
Scallops: place a large sauté pan on the stove top, turn the heat to high and add the butter. Let the butter melt for a minute or so and then add the scallops, salt and pepper. Cook the scallops for 3-5 minutes, generating a golden brown sear on each side. Use tongs to flip and cook the other side of each also. Once done, you can use a slotted turner to lift the scallops up and out of the pan and place them into a paper towel lined bowl.
Pasta: read and follow the packet instructions to cook the pasta in a medium sauce pan of boiling salted water. Moments before it is al dente, use a heatproof jug and scoop out 1-2 cups of the pasta water. Then use a colander over the sink to drain the pasta and discard the remaining water.
Combine: add the hot pasta to the sauté pan, then dollop in the pesto, measure ½ cup (125ml) of pasta water and add that in also. Now toss to combine the pasta, pesto and pasta water.
Scallops and pesto pasta: when the pesto pasta is consistently combined, add the cooked scallops back to the pan, gently stir to mix them in and allow them to heat through.
To serve: once the scallops have warmed through garnish the dish with a sprinkling of freshly grated parmesan cheese, black pepper and some basil leaves. Grab some bowls, forks and spoons and get ready to dive in!