Mary Berry's tandoori chicken recipe

Ingredients

• 4 skinless, boneless chicken breasts
• 100 ml plain full-fat yogurt
• 3 tbsp sunflower oil
• 1 small onion, peeled and grated
• 1 garlic clove, peeled and crushed
• 2 tsp ground ginger
• 1 tsp ground turmeric
• 1 tsp Madras (hot) curry powder
• 0.4 cup plain full-fat yogurt