3 medium onions, halved and thinly sliced (about 3 cups)
8 garlic cloves, minced
4 teaspoons all-purpose flour
1 teaspoon salt
1 teaspoon pepper
1 cup half-and-half cream
2 pounds uncooked shrimp (26-30 per pound), peeled and deveined
1 tablespoon grated lemon zest
2 tablespoons lemon juice
1 cup grated Parmesan cheese
2 tablespoons minced fresh parsley
In a 6-qt. stockpot, cook fettuccine according to package directions. Drain; return to pot.
Meanwhile, in a large skillet, heat butter over medium heat. Add onions; cook and stir 8-10 minutes or until tender. Add garlic; cook 1 minute longer. Stir in flour, salt and pepper until blended; gradually stir in cream. Bring to a boil, stirring constantly; cook and stir 2-4 minutes or until thickened.
Stir in shrimp, lemon zest and lemon juice; cook 3-4 minutes or until shrimp turn pink. Stir in cheese and parsley. Add to fettuccine; toss to combine.