Query with 3 models

Hi, I'm new with Django and in this Groups; I have the next models and question

class Empresa(models.Model):

usuario = models.ForeignKey(User)

empresa = models.CharField(max_length=100, unique=True)

slogan =  models.TextField()

logotipo = models.ImageField(upload_to='logos')

descripcion = models.TextField()

compra_minima = models.FloatField(verbose_name='Compra Mínima')

costo_envio = models.FloatField(verbose_name='Costo de Envío')

def __unicode__(self):

return self.empresa

class Sucursal(models.Model):

empresa = models.ForeignKey(Empresa)

direccion = models.CharField(max_length=200, null=False)

estado = models.CharField(max_length=30)

municipio = models.CharField(max_length=30)

def __unicode__(self):

return self.direccion

class Platillo(models.Model):

empresa = models.ForeignKey(Empresa)

categoria = models.ForeignKey(Categoria_platillo)

nombre_platillo = models.CharField(max_length=100, null=False, blank=False, verbose_name='Nombre del Platillo')

fotografia = models.ImageField(upload_to='platillos', verbose_name='Fotografía')

descripcion = models.TextField()

precio = models.FloatField()

dia_existencia = models.CharField(max_length=150)

fecha_publicacion = models.DateTimeField(auto_now=True)

tags = models.CharField(max_length=100)

estatus = models.BooleanField(null=False, default=True)

def __unicode__(self):

return self.nombre_platillo

class Horario(models.Model):

empresa = models.ForeignKey(Empresa)

dia = models.CharField(max_length=15)

hora_abre = models.CharField(max_length=10)

hora_cierra = models.CharField(max_length=10)

def __unicode__(self):

return self.hora_abre

Now, I want to create a result like this:

{Empresa1, Sucursal1, Platillo1, Horario1}, {Empresa1, Sucursal1, Platillo2, Horario1}, {Empresa2, Sucursal1, Platillo1, Horario1}...

I use "select_related()" method, but I can't do it

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