To start, if you haven't already, prepare the whole tilapia. Make sure the inside is clean and that the scales and fins are removed. Then, pat the fish dry before you garnish and roast it.
Place the tilapia fish inside the roasting tray. Then, score the surface of the fish by making two or three incisions on each side.
Next, brush the entire fish well with olive oil. It includes both sides as well as the cavity of the fish.
Then, spread the minced garlic inside the cavity and stuff in the fresh herbs. Next, slice one of the lemons and place the slices on the herbs inside the fish.
Squeeze some lemon juice over the surface of the tilapia. Finally, add sea salt and freshly ground black pepper on onto both sides of the fish.
Roast the tilapia for 15-25 minutes, depending on its size. The internal temperature of the tilapia should be 145ºF (62ºC).