做这道菜时，我先用洋葱、大蒜和番茄炒了一个调味底料。

When making this dish, I first sautéed a ___sofrito with onions, garlic, and tomatoes.

意式炖菜的第一步是用橄榄油将胡萝卜、芹菜和洋葱炒成调味底料。

The first step in making Italian stew is to prepare a ___sofrito with carrots, celery, and onions in olive oil.