In a medium saucepan over medium heat, melt the butter with the olive oil. Add the minced garlic and sauté for about 1 minute until fragrant.
Pour in the chicken broth and lemon juice, stirring to combine. Bring the mixture to a simmer and let it cook for 5 minutes to reduce slightly.
Stir in the capers and Dijon mustard, then continue to simmer for another 3-4 minutes until the sauce thickens slightly.
Remove the saucepan from the heat, and stir in the chopped parsley. Season with salt and pepper to taste.
Notes
Chef's Tips:• For a richer sauce, you can finish it with a splash of heavy cream.• Avoid overcooking the garlic to prevent bitterness.• Serve warm over grilled or pan-seared fish for the best results.Food Safety:• Ensure the sauce reaches a simmer to kill any potential bacteria from the chicken broth.• Refrigerate leftovers promptly and consume within 3 days.