einkaufszettel/app/routes/zettel.js

import Route from '@ember/routing/route';
import { inject as service } from '@ember/service';

export default class ProduktRoute extends Route {

  @service store;

  async model() {
    let produkte = this.store.findAll('produkt');
    let rezepte = this.store.findAll('rezept');

    return {produkte, rezepte};
  }
}