为了保持肉质鲜嫩，她决定用低温慢烤牛肉六小时。

To keep the meat tender, she decided to ___slow-roast the beef for six hours.

这位厨师偏好用慢烤的方式来逐步完善他的招牌菜。

The chef prefers to ___slow-roast his signature dish to perfect it gradually.