Dab meat dry and dice. Peel onions and cut into slices. Heat the oil in a roasting pan and fry the meat for 4-5 minutes while turning. Add onions and fry for about 1 minute. Season with salt and pepper, stir in tomato paste and thyme, add red wine and stock. Bring to the boil and braise covered for 30-40 minutes
Clean, wash and cut the leek into rings. Pumpkin clean, wash, remove seeds and cut the pumpkin into cubes. When the flesh is almost soft, add pumpkin and leek and braise for another 15-20 minutes
Wash the potatoes thoroughly, cover and cook in boiling water for about 20 minutes. Drain the potatoes, rinse briefly in cold water and remove the skin
Mix starch with 3-4 tablespoons of cold water and sour cream until smooth. Stir into the goulash and simmer for about 1 minute while stirring. Season veal goulash with salt and pepper to taste and arrange with the potatoes in the skin.