Pat the sea bream dry using paper towels to ensure the skin crisps up properly. Season both sides generously with salt and black pepper. Make shallow slits on the skin to help it cook evenly and absorb flavor
Place a frying pan over medium-high heat and add olive oil. Let the oil heat until shimmering but not smoking. A properly heated pan is key to achieving that golden, crispy skin.
Lay the fish skin-side down in the pan and press gently for even contact. Let it cook undisturbed for several minutes until the skin is crisp. Flip carefully and cook the other side until the fish is fully done.
Add crushed garlic and olives into the pan during the last few minutes of cooking. Let them warm through and infuse the oil with flavor. Squeeze fresh lemon juice over everything for brightness.
Transfer the fish to a plate and spoon the olives and pan juices over it. Top with pickled onions and fresh herbs. Serve immediately while everything is warm and vibrant.