Rustic, But Not Humble: Caramelized Onion & Emmental Galette

To be honest, I am not 100% sure that this savory bundle of gooey cheese and sweet onions, encased in a flavorful herbed crust,  can properly be called a galette. Some say that a galette is a round, flat cake, which this is not; others define it as a free-form tart, which this clearly is. But, to paraphrase Shakespeare,  a rustic tart by any other name would taste as good.