Bring a large pot of water to a boil with 1 tablespoon of salt. Cook the pasta according to package instructions until al dente.
1 tbsp. + 1 tsp. table salt, 10. oz. linguine
About 3 minutes before the pasta’s done, toss the frozen peas into the water.
1 cup frozen peas
Reserve a cup of pasta water, then drain the pasta and peas. Set aside.
In a large skillet, heat the olive oil and butter over medium heat until the butter is melted.
2 tbsps. olive oil, 3 tbsps. butter
Add the garlic and cook for about 30 seconds, just until fragrant.
2 cloves garlic
Lower the heat to medium-low and stir in the heavy cream. Let it simmer gently for 3–4 minutes until it thickens slightly.
1 cup heavy cream
Stir in the lemon zest, lemon juice, remaining salt, and black pepper. Fold in most of the smoked salmon, saving some for garnish.
1 tbsp. lemon zest, 2 tbsps. fresh lemon juice, 1/2 tsp. black pepper, 8 oz. smoked salmon
Add the pasta and peas to the skillet, tossing gently to coat in the sauce. If the sauce feels too thick, add a splash of reserved pasta water a few tablespoons at a time until it loosens up.
Stir in most of the fresh dill, saving a little for garnish.
2 tbsps. fresh dill
Taste and adjust the seasoning with more salt and pepper if needed.
Serve topped with the remaining smoked salmon and dill.