Peel the potatoes and place into a pot, cover with cold water and then boil until tender. Strain and rest until cool. Crush by hand, add egg, cornflour, sage and salt and pepper. Press the mix into a 10cm cutter and deep fry until golden.
Place the duck legs in a deep baking tray. Add 2 heads of garlic, cut in half. Season with salt and pepper, add 3 bay leaves and cover with oil. Bake at 180°C, uncovered, for 2½ hours.
Cut the figs in half lengthways, place on an oven tray, drizzle with oil, season and grill until hot. Place the potato cake in the middle of the plate, top with rocket and then the duck leg. Add grilled figs and fresh bay leaf garnish.