How to call an async method from a getter or setter?

What’d be the most elegant way to call an async method from a getter or setter in C#?

Here’s some pseudo-code to help explain myself.

async Task<IEnumerable> MyAsyncMethod()
{
    return await DoSomethingAsync();
}

public IEnumerable MyList
{
    get
    {
         //call MyAsyncMethod() here
    }
}