In a small bowl, combine the lamb rumps with oregano, rosemary, thyme, olive oil and salt and pepper, then turn to coat well.
4 lamb rumps, ½ teaspoon dried oregano, 2 teaspoon fresh rosemary leaves, 2 teaspoon fresh thyme leaves, 2 tablespoon olive oil, ¼ teaspoon fine salt, a few grinds of fresh black pepper