Turmeric, lentil and lemon soup

Name: Turmeric, lentil and lemon soup
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: Middle Eastern
Ingredients: 2 teaspoons extra virgin olive oil; 1 large red onion, finely chopped; 3 celery sticks, finely chopped; 2 garlic cloves, crushed; 2 teaspoons finely grated lemon rind; 1 teaspoon turmeric; 1/2 teaspoon ground cinnamon; 1/2 teaspoon dried chilli flakes; 500ml (2 cups) gluten-free salt-reduced vegetable stock; 135g (3/4 cup) French green lentils, rinsed, drained; 2 vine-ripened tomatoes, chopped; 150g green beans, trimmed, sliced; 100g Coles Chopped Kale; 1 tablespoon fresh lemon juice; 2 tablespoons chopped fresh coriander; Natural yoghurt, to serve (optional)