Bring salted water to a boil in a large pot and cook the pasta according to package directions. (Linguini usually takes around 9 minutes). Strain pasta in a colander, toss with a little olive oil if desired so pasta doesn't stick together. Set aside.
1 lb. linguini, 1 Tbsp. olive oil
Add 2 Tbsp. butter and the olive oil to a large frying pan over medium heat. Once hot, add the diced shallot. Let this cook for about 2 minutes, stirring occasionally.
1 Tbsp. olive oil, 4 Tbsp. unsalted butter, 1 small shallot, finely diced (about 1/3 cup)
Add in the garlic, salt, pepper, chili flakes and stir for ~30 seconds.
2 cloves garlic, minced, 1/2 tsp. salt, 1/2 tsp. black pepper, 1/2 tsp. red pepper chili flakes, 2 lemons, juiced, 1/2 cup white wine*
Then add in the lemon juice and wine. Simmer for 2 minutes.
If using frozen shrimp: Thaw the shrimp by placing them in a strainer and running cold water over them until fully thawed. Then add the thawed shrimp to the pan along with the remaining 2 Tbsp. butter and Alfredo sauce. Let this simmer again, but not too long so the shrimp doesn't become rubbery. If using uncooked (raw) shrimp: Add in the shrimp, remaining 2 Tbsp. butter, and Alfredo sauce and let simmer until the shrimp just begins to turn pink. (Small shrimp can cook in as little as 2 minutes!)
16 oz. shrimp** 31-40 size
Stir in the parsley and Parmesan.
1/4 cup fresh parsley, finely chopped, 1/2 cup freshly grated Parmesan cheese
Mix with cooked linguine and enjoy!