class BackendOven extends AbstractOven {

  public String bake(String json) {
    try {
      Payload payload = objectMapper.readValue(json, Payload.class);
      Cake cake = createCake(payload.getCake());

      bakeIngredient(payload.getRecipe(), cake);

      Cake cakeToSerialize = new Cake(cake);
      return objectMapper.writeValueAsString(cakeToSerialize);
    } catch (Exception e) {
      throw new RuntimeException("payload serialization error", e);
    }
  }

  public  BackendOven();

}