Wash pork belly, dab dry and season with salt and pepper. Place them side by side in an oiled roaster and cook in a preheated oven (electric cooker: 225 °C/ circulating air: 200 °C/ gas: see manufacturer) for approx. 30 minutes. Reduce the temperature (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) and continue cooking for approx. 1 hour
Peel and halve the onion and cut into strips. Peel and crush garlic. Heat the oil in a large frying pan. Fry the onion, garlic and fennel seeds briefly. Deglaze with cider and bring to the boil. Add the lentils and simmer for about 15 minutes
Take the pork belly out of the roaster. Put the lentils in the roasting pan, spread belly slices on the lentils and cook for another 30 minutes
Wash parsley, shake dry, pluck leaves from the stalks and chop. Place the lentils in a bowl and stir in the parsley. Arrange pork belly and lentils. Sour cream tastes good with it