À la mode

Definitions

Fashionable or in style
Referring to something that is currently popular or trendy, often used in the context of clothing or accessories
With ice cream
Typically used in the context of desserts, referring to a dish that is served with a scoop of ice cream on top
In the style of
Describing something that is done or made in a particular style or manner, often used in the context of art or design

The ice cream cone was served à la mode.

This idiom, which originated in France, literally means "in the fashion" or "in the style of". In the context of food, it refers to serving a dessert with a scoop of ice cream on top. This expression is commonly used in American English.
The restaurant's signature dish was a steak à la mode, served with a side of mashed potatoes and a rich red wine sauce.

In this example, the dish is being described as being served in a specific way, which is the traditional way of serving steak with potatoes and sauce.
After dinner, my grandmother insisted we have dessert à la mode.

In this example, the speaker is describing the way their grandmother served dessert, which was with a scoop of ice cream on top.
The bakery sold a variety of pastries à la mode, including apple pie, cherry pie, and peach cobbler.

In this example, the expression is being used to describe the way these desserts are traditionally served, which is with a scoop of ice cream on top.
The ice cream truck played a jingle as it drove down the street, and the kids ran out to buy their favorite flavors à la mode.

In this example, the expression is being used to describe the way the kids typically order ice cream from the truck, which is with a scoop of ice cream on top.