Original: However , different recipes , even in the Bolognese tradition , make use of chopped pork or pork sausage , while chicken , rabbit , or goose liver may be added along with the beef or veal for special occasions , and today many use both butter and olive oil for cooking the soffritto of small amounts of celery , carrot and onion .
Simplified: It is also popular in the United Kingdom ( where it is colloquially abbreviated to spag bol or spag bog ) and has become a staple of the British dinner table .