async function makePizza(sauceType = 'red') {

  let dough  = await makeDough();
  let sauce  = await makeSauce(sauceType);
  let cheese = await grateCheese(sauce.determineCheese());

  dough.add(sauce);
  dough.add(cheese);

  return dough;
}

// |-------- dough --------> |-------- sauce --------> |-- cheese -->

async function makePizza(sauceType = 'red') {

  let [ dough, sauce ] =
    await Promise.all([ makeDough(), makeSauce(sauceType) ]);
  let cheese = await grateCheese(sauce.determineCheese());

  dough.add(sauce);
  dough.add(cheese);

  return dough;
}

// |-------- dough -------->
// |-------- sauce --------> |-- cheese -->

function makePizza(sauceType = 'red') {

  let doughPromise  = makeDough();
  let saucePromise  = makeSauce(sauceType);
  let cheesePromise = saucePromise.then(sauce => {
    return grateCheese(sauce.determineCheese());
  });

  return Promise.all([ doughPromise, saucePromise, cheesePromise ])
    .then(([ dough, sauce, cheese ]) => {

      dough.add(sauce);
      dough.add(cheese);

      return dough;
    });
}

// |--------- dough --------->
// |---- sauce ----> |-- cheese -->

async function makePizza(sauceType = 'red') {

  let doughPromise = makeDough();
  let saucePromise = makeSauce(sauceType);

  let sauce  = await saucePromise;
  let cheese = await grateCheese(sauce.determineCheese());
  let dough  = await doughPromise;

  dough.add(sauce);
  dough.add(cheese);

  return dough;
}