WHAT ONIONS TO USE FOR FRENCH ONION SOUP RECIPES

Steps:

• Melt butter and olive oil in a pot over medium heat. Add red onions and sweet onions; sprinkle with kosher salt and sugar. Cook, stirring frequently, until onions are very tender and caramelized, about 45 minutes.
• Pour mushroom broth, sherry, Worcestershire sauce, parsley, herbes de Provence, and bay leaves into onion mixture. Bring to a simmer and cook over medium-low heat for 45 to 60 minutes.
• Reduce heat to low and remove bay leaves. Pour balsamic vinegar into soup and adjust seasoning. Mix well.
• Place Parmesan cheese rind in the center of the pot and submerge, but do not stir. Cook soup for an additional 20 minutes.
• Set an oven rack about 6 inches from the heat source and preheat the oven's broiler.
• Arrange bread slices on a baking sheet.
• Broil bread slices in the preheated oven for 2 to 3 minutes per side. Remove from the oven and set aside.
• Carefully remove cheese rind from the pot and discard.
• Fill 4 oven-safe bowls evenly with soup and sprinkle each with a light layer of grated Gruyere cheese and Parmesan cheese. Top each with 2 bread slices and sprinkle each with remaining Gruyere cheese and Parmesan cheese. Place bowls on a baking sheet.
• Broil soup in the preheated oven until cheese is browned and bubbling, 3 to 5 minutes.

Steps:

• In a Dutch oven, heat 2 tablespoons oil and butter over medium heat. Add onions; cook and stir until softened, 10-13 minutes. Reduce heat to medium-low; cook, stirring occasionally, until deep golden brown, 30-40 minutes. Add minced garlic; cook 2 minutes longer., Stir in wine. Bring to a boil; cook until liquid is reduced by half. Add broth, pepper and salt; return to a boil. Reduce heat. Simmer, covered, stirring occasionally, for 1 hour. , Meanwhile, preheat oven to 400°. Place baguette slices on a baking sheet; brush both sides with remaining 3 tablespoons oil. Bake until toasted, 3-5 minutes on each side. Rub toasts with halved garlic. , To serve, place twelve 8-oz. broiler-safe bowls or ramekins on baking sheets; place 2 toasts in each. Ladle with soup; top with cheese. Broil 4 in. from heat until cheese is melted.