Step 1

In a medium bowl, toss the shrimp with 2 teaspoons of the minced garlic, 1 tablespoon of the olive oil, and 1/4 teaspoon salt. Let the shrimp stand in this mixture for 20 minutes at room temperature while you prepare the other ingredients.

Step 2

In a large nonstick skillet, heat the rest of the oil (2 tablespoons) over medium-low heat and add the smashed garlic cloves. Stir the mixture now and then to prevent the garlic burning and cook until the garlic is light and golden, about 5 minutes. Remove the skillet from the heat and use a slotted spoon to take out the garlic, leaving as much oil as you can in the skillet. Throw the garlic away and set the skillet aside.

Step 3

In a large pot, bring at least 4 quarts of water to a boil. Add 1 tablespoon of salt once the water comes to a boil and add the pasta. Cook until the pasta is tender (look at the package directions as each brand of pasta can differ). Drain the pasta, reserving 1/4 cup of the cooking water in a small bowl. Once drained, throw the pasta back into the pot.

Step 4

While the pasta is boiling, return the skillet with the oil to medium heat and add the shrimp with the marinade to the skillet, making sure the shrimp is in a single layer. Cook the shrimp, without stirring or moving them, until the oil starts to gently bubble, about 1 to 2 minutes. Now you can start stirring the shrimp and continuing to cook until the shrimp is just cooked through, about 1-2 minutes. It will cook fast so be careful not to overcook or the shrimp will turn tough.

Step 5

Using a slotted spoon, transfer the shrimp to a medium bowl. Add the remaining 3 teaspoon minced garlic and the red pepper flakes to the skillet and cook until fragrant, about 1 minute. Add the flour and stirring constantly, cook the mixture for 1 minute. Whisk in the chicken broth and cook, whisking constantly, for 1-2 minutes, until the clumps of flour incorporate and become smooth. Whisk in the clam juice and parsley and cook until the mixture begins to thicken 2-3 minutes. Take the skillet off the heat and whisk in the butter and lemon juice. Add the shrimp and sauce to the pasta, adjusting the consistency with the pasta water if it is too dry (I didn’t need to add any pasta water to mine). Serve immediately.