Step 1: Using a small saute pan over medium heat, heat 2 tablespoons clarified butter. Add 2 tablespoons finely chopped onion and saute until transparent, about 5 minutes. Add 2 tablespoons finely chopped garlic and saute until fragrant, about 1 minute. Add 6 tablespoons lemon juice and 2 tablespoons white wine, season with salt and pepper to taste. Simmer 2 to 3 minutes to reduce liquid slightly.
Step 2: Remove pan from heat and swirl in 2 tablespoons cold butter (cut into small pieces) until sauce is smooth and emulsified.