What is "open sandwich"?

An open sandwich, also known as an open-faced sandwich or a tartine, is a type of sandwich that is made with only one slice of bread, which is typically toasted or grilled. The bread used for an open sandwich is often a thicker, heartier bread, such as sourdough or rye, which can support the weight of the toppings. The toppings for an open sandwich can vary widely and may include meats, cheeses, vegetables, spreads, and sauces. Unlike a traditional sandwich, an open sandwich is not covered with a second slice of bread. Instead, the toppings are arranged on top of the single slice of bread, creating a beautiful and visually appealing dish. Open sandwiches are often served as a light lunch or snack, and are popular in many countries around the world, particularly in Scandinavia. They can be customized to suit individual tastes and dietary preferences, and can be made with a variety of different flavor combinations.