Whisk together 4 egg yolks & 1 Tablespoon lemon juice in stainless steel bowl.
Place bowl over double boiler, continue to whisk until thick. Drizzle in melted butter. Remove from stove, add salt & pepper to taste.
1 fillet makes a serving. Doesn't look sufficient, but once it all comes together its more than enough. All my measurements are estimates pertaining to seasonings, panko and flour. Cajun seasonings can be very spicy, use to your individual taste.