I have seen any of the following used depending on the type of restaurant/cafe, food outlet etc:
(from least to most formal/expensive)
Combo Meal
Combo Menu
[insert number] course meal (e.g. soup + main course + dessert = a three course meal)
Set Meal
Set Menu
Fixed Menu
Tasting Menu
Degustation Menu
All these terms are a little different (different quality and style of food) but people use them interchangeably.
Technically a "menu" should have more than one option for the "套". e.g. a "soup menu" with two meals might be: meal 1 soup + salad + dessert, meal 2 soup + chicken + dessert
However people use both "menu" and "meal/s" to talk about the same thing (English native speakers have the worst accuracy)
To use in a sentence:
"McDonald's have a new combo meal with a cowboy theme"
"El Bulli's Spring degustation menu features produce from the Sunshine Coast of Spain in ten courses"