Hearty Vegetarian Lentil Soup with Potatoes and Vegetables

Ingredients

• 1 onion, chopped
• 3 garlic cloves, finely chopped or minced
• 2 stalks celery, finely chopped
• 1 ½ cups (180 g) cubed potatoes, approximately 4-5 small potatoes
• 2 carrots, peeled and chopped into coins
• Pinch of salt
• ½ teaspoon thyme
• ½ teaspoon marjoram
• ½ cup (100 g) dry green or brown lentils, rinsed
• ⅓ cup (40 g) shredded cheddar cheese
• 2 tablespoons sour cream
• 6 cups (1.41 kg) vegetable stock
• 2 tablespoons olive oil