First, melt your butter in a skillet over medium heat. As soon as it is melted, add in the garlic and saute for 1 minute. After a minute, the garlic should start to become fragrant. At this point, add in your fish over the garlic.

Cover your skillet and cook the fish and garlic over low heat for approximately 3 minutes. After 3 minutes, turn the fish and sprinkle the skillet with the thin green onions before covering again. Cook for another 2 to 3 minutes, or until the fish is tender enough that it flakes easily.

At which point, squeeze lemon over the fish and remove it from the skillet. Serve immediately with baby potatoes, mash or green vegetables like broad beans.