Onion soup is a type of soup made primarily with onions and often beef stock as its base. It is traditionally served with croutons or a piece of bread topped with cheese floating on its surface.
Onion soup has been enjoyed since Roman times, and the modern version hails from France, known as 'soupe à l'oignon.' Historically, it was considered food for the poor as onions were easy to grow and cheap to acquire.
The taste is savory and sweet with a rich, hearty flavor from the caramelized onions and a depth from the beef stock.

Onions
The primary ingredient, usually caramelized to bring out sweetness.
Beef Stock
Provides a rich and deep flavor base for the soup.

Butter
Used to caramelize the onions, adding richness.

Thyme
A herb that adds an earthy flavor.
Bay Leaves
Provides subtle depth and flavor.
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Bread
Commonly used as a base for melted cheese in the soup.
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Cheese
Typically Gruyère or Swiss, melted on top of the bread in the soup.
Gluten
Lactose
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