01 - Set the oven to 400°F and line a large baking tray with parchment paper.
02 - Rinse the sea bream under cold water, pat dry with paper towels, and score each side of the fish 2 to 3 times.
03 - Rub each fish inside and out with 1 tablespoon of olive oil, then season generously with salt and freshly ground black pepper.
04 - Fill the cavity of each fish with half of the lemon slices, garlic, thyme, parsley, and rosemary sprigs.
05 - Place remaining lemon slices, sliced red onion, and halved cherry tomatoes on the baking tray. Position the stuffed fish on top.
06 - Scatter any leftover herbs and sliced garlic over the fish and vegetables.
07 - Bake for 22 to 25 minutes, until the fish is opaque, flakes easily with a fork, and remains moist.
08 - Serve immediately, drizzled with pan juices and garnished with fresh herbs.