Lentil Soup Recipe

Ingredients

• 2 tablespoons olive oil
• 1 large yellow onion, finely diced
• 2 tablespoons tomato paste
• 1 teaspoon dried thyme
• 1 clove garlic, finely diced
• 3 stalks celery, finely diced
• 3 carrots, peeled and finely diced
• 2 cups (12 ounces) small green French lentils
• 8 cups water or vegetable stock
• 1 tablespoon low-sodium soy sauce
• 1-1/2 teaspoon salt, plus more to taste
• 1/8 teaspoon pepper, plus more to taste
• 3 tablespoons lemon juice, plus more to taste
• 1/2 bunch kale, stemmed and thinly sliced crosswise