Falafel tabbouleh with lemon yogurt

Name: Falafel tabbouleh with lemon yogurt
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: Mediterranean
Ingredients: 16 ready-made falafel; 200g couscous; 2 large lemons , 1 zested, juice of both; 3 tbsp olive oil; bunch spring onions , finely sliced; 1 cucumber , halved and sliced; small bunch mint , leaves roughly chopped; large bunch parsley , leaves roughly chopped; 150ml tub natural yogurt