Pour the wine into a 12-inch lidded skillet. Bring to a simmer over medium heat.
Place the dill weed in the skillet, reserving a few sprigs for garnish. Place the salmon fillets on top of the dill, skin side down. Sprinkle the salmon with kosher salt, black pepper, and garlic powder.
Cover the pan tightly with the lid or a double layer of foil.
Poach the salmon until it's no longer raw in the thickest part, for 5-10 minutes, depending on its thickness. It should reach an internal temperature of 145°F.
Serve the salmon immediately (with hollandaise sauce if you wish), or chill it for at least 2 hours and serve it cold with mayonnaise or tartar sauce.
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Notes
I made this recipe with wild-caught salmon and responsibly farmed Atlantic salmon. Both worked equally well.
A skillet with a clear lid works best, allowing you to peek inside and check on the salmon.
The liquid should cover the bottom of the pan - add water if needed. You can use fish stock instead of wine or simply use water.
Feel free to experiment with different poaching liquids and see which of them you like best. Good candidates include dry white wine, fish stock, milk, or simply water. After many experiments, my preferred liquid is white wine. I like the flavor it adds. But you should experiment and see what you like best.
Make sure to maintain a gentle simmer rather than a rolling boil. If needed, reduce the heat to medium-low.
You can keep the leftovers in a sealed container in the fridge for up to three days. I don't like to reheat them. They become dry, and their flavor suffers. Instead, I flake them and add them, cold, to a salad the next day for lunch.