Best Lentil Soup

Ingredients

• 1/4 cup extra virgin olive oil
• 1 medium yellow or white onion, chopped
• 2 carrots, peeled and chopped
• 4 garlic cloves, pressed or minced
• 2 teaspoons ground cumin
• 1 teaspoon curry powder
• 1/2 teaspoon dried thyme
• 1 large can ( 28 ounces ) diced tomatoes, lightly drained
• 1 cup brown or green lentils, picked over and rinsed
• 4 cups vegetable broth
• 2 cups water
• 1 teaspoon salt, more to taste
• Pinch of red pepper flakes
• Freshly ground black pepper, to taste
• 1 cup chopped fresh collard greens or kale, tough ribs removed
• 1 to 2 tablespoons lemon juice ( 1/2 to 1 medium lemon), to taste