Cook Pasta: Cook the whole wheat pasta according to package directions until al dente. To align with DASH diet recommendations, avoid adding salt to the pasta water. Just before draining, reserve about 1/4 cup of the pasta cooking water. Drain the pasta.
Start Sauce: While the pasta is boiling, prepare the sauce. In a spacious skillet or sauté pan, melt the unsalted butter with the extra virgin olive oil over medium-low heat.
Sauté Aromatics: Once the butter is melted and appears foamy, stir in the minced garlic and red pepper flakes. Sauté for about 45-60 seconds until the garlic is fragrant and lightly golden, being careful not to brown it.
Heat Shrimp: Introduce the thawed precooked shrimp to the pan. Toss them gently to coat with the garlic-oil mixture. Pour in the low-sodium chicken broth. Allow the mixture to come to a gentle simmer and cook for 2-3 minutes, just until the shrimp are thoroughly heated through.
Finish Sauce: Remove the skillet from the heat. Squeeze in the fresh lemon juice. Stir in the ½ teaspoon of salt, 1.5 tablespoons of the chopped fresh parsley, and freshly ground black pepper to taste. If the sauce seems too thick, you can add a tablespoon or two of the reserved pasta water to reach your desired consistency.
Serve: Portion the cooked pasta into three warm bowls. Ladle the lemon-garlic shrimp and sauce evenly over each serving. Garnish with the remaining 1/2 tablespoon of fresh parsley and a lemon wedge on the side, if desired.