Boil the vegetable broth. In a saucepan, melt the butter. Pour a leg constantly turn to acquire a golden appearance. Add onions and cook a few minutes. Add purposes mushrooms, chopped ham and shredded garlic. Cook a few minutes. Sprinkle with flour and put tomato sauce. Stirring occasionally to bathe with the sauce. Add wine and bring to the boil. Was then added and the broth was left to boil again. Reduce the heat and low heat cook about 40-50 minutes. Heat the oven to 200C, with a slotted spoon to take out the meat and vegetables and transfer to the tray. Strain is the remains of the sauce and pour the meat. Bake for about 20 minutes.