Ingredients
Method
- Toast the shells in 1 tbsp butter, medium heat, 2 minutes, until orange.
- Add broth, 2 tbsp lemon juice and vinegar. Simmer 8 minutes, then strain and discard the shells.
- Drop the linguine into the boiling salted water as the broth comes off. Cook about 8 minutes to al dente.
- Season the shrimp. Sear in olive oil over medium-high in 2 batches: 60 to 75 seconds, flip, 30 to 40 more.
- Pull each batch at a loose C shape.
- Drop to medium-low. Cook garlic and pepper flakes 30 seconds.
- Add the strained broth, scrape the pan, and reduce about 3 minutes to 1/2 cup.
- Save 1 cup of pasta water, then drain the linguine.
- Take the pan off the heat. Swirl in cold butter cubes until glossy and pale gold.
- Return to low heat with linguine, shrimp, 1/4 cup pasta water, zest, 1 tbsp lemon juice and parsley.
- Toss 60 to 90 seconds until the sauce clings. Serve at once with lemon wedges.
Notes
Peeled shrimp work: skip the shells and put 3/4 cup broth and 2 tbsp lemon juice straight into the skillet. The sauce tastes less like shrimp.
For Morton kosher salt, use about half of each salt measurement.
Peeling and the shell broth can be done a day ahead. Season the shrimp just before cooking.
Storage Notes:
Refrigerate within 2 hours in a shallow lidded container. Eat within 3 days, best by day 2.
Reheat in a skillet on low with 2 tbsp water, covered, 3 to 4 minutes. Add the shrimp back for the last 30 seconds.
Skip freezing the finished dish. Freeze spare shells for the next batch of broth.
