Authentic French Onion Soup Recipe (Gratinée)

Name: Authentic French Onion Soup Recipe (Gratinée)
Total time: 1 hr 15 mins
Ingredients: 4 tablespoons butter; 2 large red onions, thinly sliced; 2 large sweet onions, thinly sliced; 1 teaspoon salt; 1 (48 fluid ounce) can chicken broth; 1 (14 ounce) can beef broth; 0.5 cup red wine; 1 tablespoon Worcestershire sauce; 2 sprigs fresh parsley; 1 sprig fresh thyme leaves; 1 bay leaf; 1 tablespoon balsamic vinegar; salt and freshly ground black pepper to taste; 4 thick slices French bread; 8 slices Gruyère cheese, at room temperature; 0.5 cup shredded Asiago cheese, at room temperature; 4 pinches paprika

This is truly the best French onion soup recipe. After perfecting it for 30 years, it consistently delights. The presentation is exquisite!

Total time1 hr 15 mins
Prep time15 mins
Cook time1 hr
Yield4

Adjust servings

Scale ingredients instantly for the number of servings you need.

Servings

Instructions

Melt butter in a large pot over medium-high heat. Add red onions, sweet onions, and salt. Cook, stirring often, until onions caramelize and become almost syrupy, around 35 minutes.
Incorporate chicken broth, beef broth, red wine, and Worcestershire sauce. Tie parsley, thyme, and bay leaf together with kitchen twine; add to the pot. Simmer over medium heat for 20 minutes, stirring occasionally. Take out and throw away the herb bundle. Lower the heat to low; mix in vinegar and season with salt and pepper. Cover the soup and keep it warm on low heat while preparing the toast.
Position an oven rack approximately 6 inches from the heat source and preheat the oven's broiler. Place bread slices on a baking sheet and broil, turning once, until nicely toasted on both sides, about 3 minutes. Take off heat; leave the broiler on.
Place 4 large oven-safe bowls or crocks on a rimmed baking sheet. Fill each bowl 2/3 full with the warm soup. Put 1 slice of toasted bread, 2 slices of Gruyère cheese, and 1/4 of the Asiago cheese on top of each bowl. Lightly sprinkle paprika over each one.
Broil until bubbly and golden brown, about 5 minutes. The cheese will drip over the sides of the crock and create a beautifully melted, crusty seal as it melts.
Serve hot and enjoy this amazing French onion soup!

Nutrition

Calories: 618 kcal
Fat Content: 36 g
Fiber Content: 4 g
Sodium Content: 3241 mg
Protein Content: 30 g
Cholesterol Content: 114 mg
Carbohydrate Content: 39 g
Saturated Fat Content: 21 g
Unsaturated Fat Content: 0 g