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Caramelized Onion Red Lentil Soup Recipe

4.4 from 74 reviews

A hearty and flavorful Caramelized Onion Red Lentil Soup that combines sweet caramelized onions with warm spices, tender red lentils, and fresh vegetables. This nutritious and comforting soup is perfect for a cozy meal, offering a delightful balance of textures and aromatic flavors, finished with a splash of lemon juice and fresh herb garnish.

Ingredients

Scale

Soup Base

  • 2 tablespoons olive oil
  • 3 large onions, thinly sliced
  • 3 cloves garlic, minced

Spices

  • 2 teaspoons ground cumin
  • 1 teaspoon smoked paprika

Main Ingredients

  • 1.5 cups red lentils, rinsed and drained
  • 6 cups vegetable broth or water
  • 1 can (14.5 ounces) diced tomatoes
  • 2 carrots, diced

Seasoning and Garnish

  • 1 teaspoon salt (adjust to taste)
  • ½ teaspoon black pepper (adjust to taste)
  • 1 tablespoon lemon juice
  • Fresh parsley or cilantro for garnish (optional)

Instructions

  1. Caramelize Onions: Heat the olive oil in a large pot or Dutch oven over medium heat. Add the sliced onions and a pinch of salt. Cook, stirring occasionally, for about 15-20 minutes until the onions are deeply caramelized and golden brown, which develops their natural sweetness and rich flavor.
  2. Add Garlic and Spices: Stir in the minced garlic, ground cumin, and smoked paprika. Cook for 1-2 minutes, stirring frequently, until the spices are fragrant, which infuses the soup base with warm, smoky flavor notes.
  3. Cook Carrots: Add the diced carrots to the pot and cook for an additional 5 minutes, allowing them to soften and blend their mild sweetness into the base.
  4. Add Lentils, Broth, and Tomatoes: Pour in the rinsed red lentils, vegetable broth, and canned diced tomatoes. Stir well to combine all ingredients evenly. Bring the mixture to a boil over medium-high heat.
  5. Simmer Soup: Reduce the heat to low, cover the pot, and let the soup simmer gently for about 20 minutes until the lentils are tender and cooked through, creating a hearty texture.
  6. Blend Soup (Optional): If you prefer a smoother consistency, use an immersion blender to puree the soup directly in the pot until reaching your desired texture. Otherwise, leave it chunky for a rustic feel.
  7. Season and Brighten: Stir in the salt, black pepper, and lemon juice. Taste and adjust seasoning as needed to balance the flavors with acidity and seasoning.
  8. Serve and Garnish: Ladle the hot soup into bowls and garnish with fresh parsley or cilantro if desired, adding freshness and color to the final presentation.

Notes

  • To deepen the caramelization, be patient and stir onions occasionally to prevent burning.
  • The soup can be stored in an airtight container in the refrigerator for up to 4 days or frozen for up to 3 months.
  • For extra protein, add cooked chicken or dollops of Greek yogurt on serving.
  • Adjust the seasoning and spices according to your taste preference.
  • Use vegetable broth for a vegetarian or vegan version.

Keywords: caramelized onion soup, red lentil soup, vegetarian soup, healthy lentil soup, Mediterranean soup, comfort food, easy lentil recipe