Trying to call an Angular Component's method in the template

my-component.ts

@Component({
  selector: 'my-component',
  template: `
    <my-component [value]="someValue">
      <!-- Does not work -->
      <div>{{aFunctionThatExistsInMyComponent()}}</div>
    </my-component>`
})
export class MyComponent {
  value: string;
  aFunctionThatExistsInMyComponent() {
    return "I wish this worked";
  }
}