Old San Francisco Steakhouse’s French Onion Soup: A Culinary Classic

That first chill of autumn always brings me back to the bustling kitchen of a long-gone San Francisco restaurant. The air, thick with the savory aroma of caramelized onions and simmering broth, was a welcome hug after a busy shift. It was there, amidst the clatter of pans and the shouts of the line cooks, that I first tasted French Onion Soup done right – a deeply flavorful, soul-warming elixir that instantly became a personal favorite and a dish I’ve been striving to perfect ever since.

Recipe Overview

• Prep Time: 30 minutes
• Cook Time: 1 hour 10 minutes
• Total Time: 1 hour 40 minutes
• Servings: 16
• Yield: 1 gallon
• Dietary Type: Not Gluten-Free, Not Dairy-Free

Ingredients

• 2 tablespoons clarified butter
• 2 large red onions, thinly sliced
• 6 large yellow onions, thinly sliced
• 2 quarts beef stock
• 2 quarts chicken stock
• 12 ounces dry sherry
• 1 1/2 tablespoons brown sugar
• 3 teaspoons ground black pepper
• 1 1/2 – 2 teaspoons fresh thyme leaves (or 3/4 teaspoon dried thyme)
• 2 tablespoons minced fresh parsley
• Paprika, to taste
• 1 teaspoon chopped scallion
• Sourdough croutons or toasted pieces French bread
• Thinly sliced Swiss cheese

Equipment Needed

• Large, heavy-bottomed pot
• Fork
• Warmed bowls (or onion bowls, see instructions)
• Broiler (optional)

Instructions

1. Begin by heating the clarified butter in a large, heavy-bottomed pot over moderate heat. The clarified butter will provide a rich flavor without burning as easily as regular butter.
2. Add the thinly sliced red and yellow onions to the pot. Use a fork to separate the rings of the onions, ensuring even cooking.
3. Cover the pot and sauté the onions, stirring occasionally, for approximately 10 minutes. This initial sautéing step helps to soften the onions and release their natural sugars.
4. Raise the heat to medium-high and continue to cook, stirring often, until the onions are very soft and achieve a deep golden-brown color. This caramelization process is crucial for developing the soup’s signature flavor. This will take about 20 minutes more. Be patient and stir frequently to prevent burning.
5. Carefully pour in the beef stock and chicken stock. The combination of stocks provides a balanced and complex flavor profile.
6. Add the dry sherry, which will contribute a subtle sweetness and depth.
7. Stir in the brown sugar, ground black pepper, thyme, and parsley. These seasonings will enhance the savory notes of the soup.
8. Season with paprika to taste. Paprika adds a hint of smokiness and color.
9. Add the chopped scallion.
10. Simmer the soup for at least 10 minutes, or longer if desired, to allow the flavors to meld together beautifully. The longer it simmers, the richer the flavor will become.
11. To serve, pour the soup into warmed bowls. Warming the bowls prevents the soup from cooling down too quickly.
12. Top each bowl with sourdough croutons or toasted pieces of French bread. These provide a satisfying textural contrast to the smooth soup.
13. Cover the croutons with thinly sliced Swiss cheese.
14. Optional: For the ultimate steakhouse experience, place the bowls under the broiler until the cheese is melted, bubbly, and lightly browned. Watch carefully to prevent burning.

To clarify butter: Melt butter in a heavy pan over low heat. Skim off froth and carefully pour clear liquid into another container, being careful to leave the milky residue behind.

Serving Suggestion from Old San Francisco Steakhouse: At the restaurant, they served this soup in onion bowls – very large yellow onions with the root cut off and the insides mostly scraped out with an ice cream scoop. The scooped-out onion can be added to the soup. After topping them with croutons and cheese, they were placed under the broiler until bubbly.

Expert Tips & Tricks

• Patience is key when caramelizing the onions. Don’t rush the process. The deep golden-brown color is where all the flavor comes from.
• Use a heavy-bottomed pot to prevent the onions from burning.
• Deglaze the pot with a splash of sherry halfway through caramelizing the onions to lift any browned bits from the bottom, adding even more flavor.
• If you don’t have clarified butter, you can use regular butter, but be careful not to burn it. Cook over slightly lower heat.
• For a richer flavor, use homemade stock.
• If you don’t have sherry, you can substitute dry white wine or even a splash of balsamic vinegar for acidity.
• To deepen the flavour of the broth and onions you can add 1 tsp of beef bouillon powder to the soup.

Serving & Storage Suggestions

Serve the soup immediately after broiling (if using), while the cheese is still melted and bubbly. Garnish with an extra sprinkle of fresh parsley for visual appeal.

Leftover soup can be stored in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stovetop or in the microwave. The croutons and cheese are best added fresh, so store them separately and add them just before serving.

Freezing is not recommended as the texture of the onions may change.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	191.6 kcal	N/A
Calories from Fat	N/A	15%
Total Fat	3.2 g	4%
Saturated Fat	1.4 g	7%
Cholesterol	7.4 mg	2%
Sodium	571.5 mg	23%
Total Carbohydrate	16.3 g	5%
Dietary Fiber	1.2 g	4%
Sugars	7.2 g	N/A
Protein	5.2 g	10%

Note: Nutritional information is an estimate and may vary based on specific ingredients and portion sizes.

Variations & Substitutions

• Vegetarian: Use vegetable stock instead of beef and chicken stock.
• Gluten-Free: Use gluten-free bread for the croutons.
• Vegan: Substitute the butter with olive oil, use vegetable stock, and omit the cheese, or use a vegan cheese alternative.
• Spicy: Add a pinch of red pepper flakes to the soup for a kick.

FAQs (Frequently Asked Questions)

Q: Can I make this soup ahead of time?
A: Yes, you can make the soup base a day or two in advance. Store it in the refrigerator and add the croutons and cheese just before serving.

Q: What’s the best type of cheese to use?
A: Swiss cheese is traditional, but Gruyere or provolone also work well. The cheese should be a good melting cheese for the best results.

Q: Can I use a different type of onion?
A: While red and yellow onions are recommended for their flavor and sweetness, you can use other types of onions, such as white or Vidalia, in a pinch.

Q: Can I add wine to the soup instead of sherry?
A: Yes, a dry white wine like Sauvignon Blanc or Pinot Grigio can be used as a substitute for sherry.

Q: How can I prevent the croutons from getting soggy?
A: Toast the croutons well before adding them to the soup, and add them just before serving.

Final Thoughts

This French Onion Soup recipe is a tribute to the flavors I remember so fondly from that bustling San Francisco kitchen. The rich, deeply savory broth, the sweet caramelized onions, and the bubbling, melted cheese create a symphony of flavors that is both comforting and sophisticated. I encourage you to try this recipe and share your own experiences and adaptations. Pair it with a crusty loaf of bread and a glass of red wine for a truly unforgettable meal. Bon appétit!