Wash the potatoes and boil in water for about 20 minutes. Wash kale thoroughly, blanch in boiling salted water for about 5 minutes. Drain and chop. Peel onions and cut into slices.
Heat 3 tablespoons of lard in a roaster. Add onions and kale. Pour in broth, season with cloves, pimento and cinnamon and bring to the boil. Braise in the preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: level 3) in a closed roaster for about 45 minutes.
Drain the potatoes, rinse and peel them. Pears wash, halve, remove core. Cut pears into pieces. Wash duck breast, dab dry. Cut skin several times. Fry the duck in a pan, first from the skin side, then from the meat side, and remove.
Remove the roaster from the oven after 30 minutes. Fold the pears into the kale. Season the duck breasts with salt and pepper and place them on the kale with the skin facing upwards. Put the roaster without the lid back into the oven and finish roasting.
Heat 2 tablespoons of lard in a pan. Fry the potatoes for about 10 minutes while turning. Season with salt and pepper. Sprinkle with sugar and lightly caramelise the potatoes. Remove the duck breast and cut into slices.
Arrange on the kale. Add the roast potatoes.