Tomato and lentil soup

Ingredients

• 1 tbsp olive oil
• 1 onion (roughly chopped)
• 2 stalks celery (roughly chopped)
• 1 carrot (peeled and roughly chopped)
• 1 garlic clove (crushed)
• 1 tsp ground cumin
• 1/2 tsp ground coriander
• 1 cup split red lentils
• 5 1/3 cups diluted salt-reduced or homemade vegetable stock
• 1/2 a 796ml can Roma tomatoes
• 2 tsp tomato paste
• 1 bay leaf
• 2 tbsp cilantro (chopped)
• 1/3 Greek-style yogourt