Bring a large pot of salted water to a boil and cook the linguine according to package instructions until al dente.
While the pasta cooks, pat the shrimp dry with paper towels and season them on both sides with sea salt and black pepper.
Mince the garlic cloves and finely chop the fresh parsley.
In a large skillet, heat the extra virgin olive oil and 0.5 tablespoons of the grass-fed butter over medium heat until the butter is melted and bubbling.
Add the minced garlic and red pepper flakes to the skillet, sautéing for about 1 minute until fragrant but not browned.
Increase the heat to medium-high and add the shrimp to the skillet in a single layer, cooking for 2 minutes per side until they are pink and opaque.
Stir in the remaining 0.5 tablespoons of butter, lemon juice, and lemon zest, tossing the shrimp to coat them in the sauce.
Drain the linguine and add it directly to the skillet, tossing everything together for 1 minute so the pasta absorbs the garlic butter.
Garnish with the fresh parsley and serve immediately while hot.