Tricolore couscous salad

INGREDIENTS

• 200g couscous
• 2 tsp vegetable stock (or use a cube)
• 250g pack cherry tomatoes , halved
• 2 avocados , peeled, stoned and chopped
• 150g pack mozzarella , drained and chopped
• handful rocket or young spinach leaves
• 1 rounded tbsp pesto
• 1 tbsp lemon juice
• 3 tbsp olive oil