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5 from 1 vote

Brennan’s Onion Soup

Make Brennan’s Onion Soup at home. 
Course Soup
Cuisine French
Keyword Brennan's Onion Soup
Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes
Servings 8
Calories 504kcal
Author Stephanie Manley


  • 1 1/2 cups butter
  • 4 cups sliced onions
  • 1 3/4 cups all purpose flour
  • 12 cups beef stock
  • 1/2 teaspoon Cayenne Pepper
  • 1 1/2 tablespoon salt
  • 1 egg yolk
  • 2 tablespoon Cream


  • In a six-quart soup kettle melt butter, add onions and reduce heat to very low, cooking until onions are melted down. Be careful not to brown in the first stage of cooking. Add flour and cook 5 to 10 minutes more, stirring occasionally. Blend in stock, salt, and bring to a boil. Reduce heat and simmer about 15 minutes. 
  • Remove kettle from heat. Beat together egg yolk and cream. Add a little of the soup and mix quickly, then add to soup kettle. Serve in soup cups with toasted rounds of bread or croutons and sprinkle with grated Parmesan cheese, buttered breadcrumbs. Brown under broiler flame and serve.


Calories: 504kcal | Carbohydrates: 32g | Protein: 11g | Fat: 37g | Saturated Fat: 23g | Cholesterol: 121mg | Sodium: 2331mg | Potassium: 822mg | Fiber: 2g | Sugar: 5g | Vitamin A: 24.1% | Vitamin C: 7.2% | Calcium: 6.7% | Iron: 13.7%
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