Preheat oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Line a baking tray with baking paper. Wash pumpkin, cut into slices and remove seeds. Cut flesh into 1 1⁄2-2 cm cubes. Cut feta into 1 1⁄2-2 cm cubes.
Peel garlic and chop finely. Wash the thyme, shake dry, remove the leaves from the stalks and chop finely. Mix lemon zest, oil, thyme and garlic. Mix the pumpkin and feta cubes with half the oil mixture.
Spread the pumpkin on the baking tray and season with salt. Bake in the hot oven for about 20 minutes. Add Fetawürfel after about 12 minutes. Sprinkle everything with sesame seeds. Take out and put on wooden skewers.