Liver in onion

Ingredients

• 600 g. of veal liver cut in thin
• ½ kg. of onions
• 1 small glass of olive oil / 4 spoonfuls
• 1 spoonful of butter
• 1 spoonful of chopped parsley
• 1 small glass of stock
• 8 slices of white bread
• 1 cup of flour
• Salt