Separate the thyme and rosemary leaves from the stems and chop them. Peel and finely chop the garlic.
Mix olive oil with garlic, thyme, rosemary, salt and pepper.
Rub the lamb with the mixture and leave for 20 minutes. Preheat the oven to 180 °C and prepare the foil.
Wrap the lamb in foil and place in a preheated oven for 30 minutes.
Remove the foil and bake for another 30 minutes.