
Bring a pot of water to a boil. Cook the spaghetti according to package instructions until al dente. Drain, reserving 1/3 cup of the pasta water, and set aside.
Heat a skillet with the unsalted butter and olive oil. Sauté the garlic, then add the shrimp. Cook the shrimp until the surface turns opaque, then add the spaghetti, reserved pasta water, white wine, salt, and spinach. Stir to combine well.
Turn off the heat, stir in the parsley, and serve the pasta immediately with lemon wedges.