Season fish fillets with salt, pepper and garlic powder.
Heat the ghee (or olive oil) in a large skillet over medium-high heat; add fish and sear for 2 to 4 minutes per side or until fillets flake easily when tested with a fork; remove pan and set aside.
Reduce skillet heat to low; add coconut milk, lemon juice and dill. Bring to a simmer and cook for 3 minutes; serve sauce over fish filets.