In a large soup pot, heat oil over medium heat. Add onion and cook, stirring occasionally, for 5 minutes or until onions are soft and glassy.
2 tablespoon olive oil, 1 large white or yellow onion
Stir in carrots, lentils, garlic, ginger, ground cumin, salt, and pepper and continue cooking for 2 more minutes.
2 lbs carrots, 1 cup red lentils, 2 cloves garlic, 2 teaspoon grated fresh ginger, ½ teaspoon ground cumin, 2 teaspoon salt, ½ teaspoon black pepper
Add broth, and baking soda. Bring to a gentle simmer, cover and cook for 15 minutes.
4 cups vegetable or chicken broth, no or low-sodium, ½ teaspoon baking soda
Remove from heat and, working in batches, transfer to a blender and blend to a smooth consistency.
Transfer back to a soup pot and stir in vinegar. Taste and add more salt and pepper if necessary.
1 teaspoon apple cider vinegar
Serve garnished with optional toppings if desired.