Preheat the oven to 275°F to 300°F
Place the salmon on a baking sheet or in an oven-safe dish
Add a small amount of water, broth, or oil to keep it moist
Cover loosely with foil
Heat for 10 to 15 minutes, until warmed through
Check that the internal temperature reaches 125°F to 130°F for serving
Use a skillet over low heat if reheating on the stovetop
Heat gently for a few minutes per side
Avoid high heat to prevent drying out
Use the microwave only on low power in short intervals if needed
Cover the salmon and stop heating as soon as it is warm
Serve immediately after reheating