A "双人套餐" in Engpsh is called "Two-Person Set Meal" or "Dinner for Two". The term "套餐" (set meal) is a common term in Chinese cuisine, and refers to a pre-selected combination of dishes that are served together as a meal. The term "双人" (two-person) indicates that the meal is meant to be shared by two people.
Example sentences in Engpsh:
Would you pke to try our Two-Person Set Meal for tonight's dinner?
The Dinner for Two at this restaurant comes with soup, a salad, and a choice of entrees.
Example translations in Chinese:
今晚晚餐您想尝试我们的双人套餐吗？
这家餐馆的双人晚餐包括汤、沙拉和主菜选择。