Brush a 150g-turkey skinless breast with oil, squeeze over some lime and grind over some black pepper. Grill under a hot grill, turning several times to cook thoroughly through. Meanwhile, boil 200g sweet potatoes until soft and mash with 100ml skimmed milk until smooth. Season with cayenne pepper and fresh parsley. Serve with the grilled turkey with lots of steamed green beans on the side. Have a 100g-pot crème caramel to follow.