Abstract Class (Recipe):?

Short answer: The Recipe class defines the template method Cook, which contains the algorithm's skeleton. It delegates the implementation of specific steps (GatherIngredients, Prepare, and CookMethod) to subclasses by making them abstract. The Serve method is concrete and always executes the same way for all recipes. public abstract class Recipe

Example code

{
public void Cook()
{ GatherIngredients(); Prepare(); CookMethod(); Serve(); } protected abstract void GatherIngredients(); protected abstract void Prepare(); protected abstract void CookMethod(); private void Serve() => Console.WriteLine("Serving the dish.");
}

Real-world example (ShopNest)

Use a GoF pattern in ShopNest only when it removes duplication or makes a change safer—explain the problem it solves in the interview.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.