Red Onion Soup
A rich, savory red onion soup with caramelized onions, complemented by red wine, thyme, and topped with Swiss cheese and toasted bread, perfect for comforting meals.
Ingredients
Instructions
- Slice the red onions.
- Melt 3 tablespoons of butter in a large pan.
- Add the sliced onions and 1 teaspoon of salt.
- Cook over medium-low heat, stirring occasionally, until golden, about 30 to 40 minutes.
- Add the red wine and cook for 5 minutes.
- Add chicken stock and dried thyme.
- Cook for an additional 15 minutes. Season with salt and pepper to taste.
- Toast the bread slices.
- Ladle the soup into bowls and top with the toasted bread slices and grated Swiss cheese.
- Broil until the cheese is melted and bubbly, then garnish with chopped parsley.
Tips & Substitutions
For a sweeter flavor, consider using Vidalia onions instead of red onions. If you prefer a vegetarian option, substitute chicken stock with vegetable stock. To enhance the soup's depth, add a splash of balsamic vinegar along with the red wine. Ensure to stir frequently while the onions caramelize to avoid burning.
Serving Suggestions
Serve the red onion soup with a side salad or a light appetizer, as it pairs wonderfully with a fresh green salad. For added richness, consider serving with a dollop of crème fraîche. This soup is perfect for a cozy dinner, especially when paired with chicken recipes for a complete meal.
Storage & Reheating
Leftover red onion soup can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, simply warm it on the stovetop over low heat, adding a splash of water or extra stock if it has thickened. Avoid using the microwave as it may affect the texture of the cheese.
Nutrition & Diet Analysis (per serving)
Each serving of Red Onion Soup contains roughly 637 calories, with 39g protein, 28g carbohydrates, and 41g fat. It is an excellent source of calcium (94% of the Daily Value), protein (79% of the Daily Value), and vitamin A (44% of the Daily Value), and a good source of dietary fiber. Note that it is relatively high in sodium, at 2355mg per serving (102% of the Daily Value).
Estimated from ingredients & per-serving nutrition — verify against package labels for allergies or strict diets.
* % Daily Values based on a 2,000 calorie diet (FDA 2020).
Frequently Asked Questions
Can I make this soup ahead of time?
Yes, this soup can be made a day in advance. Simply cool it completely, refrigerate, and reheat before serving. The flavors will deepen as it sits, making it even more delicious.
What can I use instead of Swiss cheese?
If Swiss cheese isn't available, Gruyère or even a mild mozzarella can be great substitutes. Both will melt nicely and complement the flavors of the soup.
Is it possible to freeze the soup?
Yes, you can freeze red onion soup for up to 3 months. Ensure it cools before transferring to freezer-safe containers. Thaw in the refrigerator overnight before reheating.
Nutrition is estimated from USDA FoodData Central ingredient data and may vary with brand, portion and preparation — see our methodology. This information is for general educational purposes only and is not medical or dietary advice (disclaimer).