Roast chicken soup

INGREDIENTS

• 1 tbsp olive oil
• 2 onions , chopped
• 3 medium carrots , chopped
• 1 tbsp thyme leaves, roughly chopped
• 1.4l chicken stock
• 300g leftover roast chicken , shredded and skin removed
• 200g frozen peas
• 3 tbsp Greek yogurt
• 1 garlic clove , crushed
• squeeze lemon juice