For the roast, wash the meat, dab dry and cut the rind with a sharp knife in a diamond shape, but do not cut through it. Place the roast in a roasting pan with the rind facing upwards. Roast in a preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer) for approx. 1 hour.
Peel the onions. Peel and wash the carrots. Cut both into pieces. Wash thyme and shake dry. Spread everything around the roast. Season with salt and pepper. Add pineapple nectar and 1⁄4 l water. Continue cooking for about 1 hour.
Increase oven temperature (electric oven: 225 °C/circulating air: 200 °C/gas: see manufacturer) and continue roasting for approx. 15 minutes. Heat up jam, pass through a sieve. Coat the roast crust with the jam and fry for another 3-5 minutes until crispy.
For the sauce, remove the roast and keep warm. Pour the roast stock through a sieve into a pot and, if necessary, top up to approx. 800 ml with water. Stir starch and 2 tbsp. water until smooth. Thicken the sauce with it. Season to taste with pepper. Serve everything.