1. Mix the dill sauce ingredients together (mix well to loosen the sour cream). Adjust consistency with oil and tartness with lemon juice. Set aside for 10 minutes if you can – if using fresh garlic, set aside for 20 min.
2. Pat fish dry with paper towel. Sprinkle with salt and pepper.
3. Heat oil in skillet over medium high heat. Place fish in skillet skin side down. Cook for 2 minutes, then flip and cook the other side for 1 1/2 minutes.
4. Remove from skillet onto serving plates. Serve with dill sauce on the side, garnished with fresh dill and lemon wedges if desired.