Step 1

Using paper towels, pat both sides of the salmon fillets dry; season with 1 teaspoon salt and 1/2 teaspoon pepper.

Step 2

Melt butter in a large cast iron skillet over medium heat. Add salmon fillets to the skillet, skin side up, and cook until golden brown and a crust has formed, about 4-5 minutes. Using a fish turner, flip, and cook for an additional 4-5 minutes, or until desired doneness. Remove and keep warm.

Step 3

Reduce heat to low; add garlic and shallots, and cook, stirring frequently, until fragrant, about 2 minutes.

Step 4

Whisk in flour until lightly browned, about 1 minute.

Step 5

Stir in wine, scraping any browned bits from the bottom of the skillet.

Step 6

Stir in chicken stock and half and half until slightly thickened, about 2-3 minutes; season with salt and pepper, to taste.

Step 7

Stir in spinach until wilted, about 1-2 minutes. Return salmon to the skillet; sprinkle with dill.

Step 8

Serve immediately with lemon wedges.