Cut the onion, carrots and celery into small cubes, the leek into thin rings. Mix together the ketchup, water, vinegar, Worcestershire sauce, Tabasco, sugar and salt. Place the meat in a casserole dish with a lid, distribute the vegetables around the meat. Pour the sauce over it.
Cook in the oven at 200 ° for 1 hour with the lid and 1/4 hour without the lid.