Easy spicy butter chicken soup

Ingredients

• 500 gram boneless chicken breast, sliced very thinly
• 1 teaspoon grated ginger
• juice of ½ a lemon
• pinch of ground chilli (optional)
• 1/2 tablespoon oil
• 1/2 capsicum, finely chopped
• 2 carrots, peeled, thinly sliced in half circles
• 1 tablespoon plain flour
• 750 millilitre chicken stock
• 500 gram butter chicken simmer sauce
• 1 tablespoon tomato paste
• coriander and natural yoghurt or cream, to serve (optional)
• naan bread, to serve