Bring a large pot of salted water to a boil and cook the orecchiette according to package directions until al dente.
While the pasta cooks, pat the shrimp dry with paper towels and season evenly with sea salt and black pepper.
Melt the grass-fed butter in a large skillet over medium heat.
Add the minced garlic to the skillet and sauté for about 1 minute until fragrant but not browned.
Increase the heat slightly and add the shrimp, cooking for 2-3 minutes per side until they turn pink and opaque.
Stir in the lemon juice, lemon zest, and baby spinach, tossing until the spinach is just wilted.
Drain the pasta, reserving 2 tablespoons of pasta water, and add both to the skillet.
Toss everything together until the pasta is coated in a glossy sauce, then garnish with fresh parsley and serve immediately.