Vidalia Onion Soup Au Gratin
A rich, savory onion soup topped with toasted French bread and melted cheese, perfect for cozy gatherings and satisfying comfort food lovers.
Ingredients
- 3 large Vidalia onions, thinly sliced ⓘ
- 1/2 cup butter ⓘ
- 1/2 cup finely diced smoked sausage ⓘ
- 1/4 cup diced garlic
- 3 tablespoons flour ⓘ
- 2 quarts beef stock ⓘ
- 1/2 cup Madeira wine
- 1/2 cup sliced green onions ⓘ
- 1/2 cup chopped parsley ⓘ
- 10 slices French bread ⓘ
- 2 cups shredded Mozzarella cheese ⓘ
- Grated Parmesan cheese ⓘ
Instructions
- Butter the French bread slices and toast until golden brown.
- In a heavy-bottom Dutch oven, melt butter over medium-high heat.
- Add sliced onions and sauté until caramelized, about 30 minutes.
- Add diced smoked sausage and garlic; stir and cook for 5 minutes.
- Add flour and stir well.
- Gradually add beef stock, stirring constantly.
- Bring to a rolling boil, then reduce heat to simmer and cook for 45 minutes.
- Add Madeira wine, salt, and pepper to taste.
- Add sliced green onions and chopped parsley; cook for an additional 5 to 10 minutes.
- Preheat the broiler.
- Ladle soup into bowls, top each with toasted bread slices and shredded mozzarella cheese.
- Broil until the cheese bubbles and is golden brown.
Tips & Substitutions
For an extra depth of flavor, consider using a mix of onions, like yellow or sweet onions, if Vidalias are unavailable. If you prefer a vegetarian version, substitute the beef stock with vegetable stock and omit the smoked sausage. You can also use Gruyère cheese instead of mozzarella for a more traditional touch. Make sure to stir the soup regularly to prevent sticking.
Serving Suggestions
Serve the Vidalia Onion Soup Au Gratin with a fresh green salad or a side of roasted vegetables for a complete meal. A glass of dry white wine, like Sauvignon Blanc, can complement the flavors beautifully. If you're looking for more hearty options, pair it with Spicy Hamburgers for a delightful contrast. This soup also makes a wonderful starter for a dinner party.
Storage & Reheating
To store leftovers, let the soup cool completely before transferring it to an airtight container. It can be kept in the refrigerator for up to 3 days. When reheating, warm it gently on the stovetop over low heat, adding a splash of beef stock or water to maintain the desired consistency. Avoid reheating in the microwave, as it may alter the texture.
Nutrition & Diet Analysis (per serving)
Each serving of Vidalia Onion Soup Au Gratin contains roughly 318 calories, with 14g protein, 41g carbohydrates, and 12g fat. It is an excellent source of iron (54% of the Daily Value), protein (29% of the Daily Value), and vitamin C (25% of the Daily Value), and a good source of calcium. Note that it is relatively high in sodium, at 689mg per serving (30% 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 in advance?
Yes, this soup can be made in advance and stored in the refrigerator for up to 3 days. In fact, the flavors often deepen after a day. Just reheat gently on the stovetop before serving, and broil the cheese topping just before serving for that perfect golden finish.
What can I substitute for Madeira wine?
If you don’t have Madeira wine, you can substitute it with dry sherry or even a splash of red wine for a different flavor profile. Just make sure to adjust the seasoning, as the wine's sweetness or acidity may vary. You can also use a non-alcoholic option like grape juice mixed with a bit of vinegar.
Can I freeze the soup?
Freezing is not recommended for this soup due to the dairy in the cheese, which can change texture upon thawing. However, you can freeze the soup base (without cheese or bread) for up to 3 months. Just thaw and add fresh cheese and bread when you're ready to serve.
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).