Caponata Siciliana with sweet potatoes on the side

Ingredients

• 500g aubergine,
• 4 tbls tomato puree,
• 150g cherry tomatoes,
• 500g sweet potato,
• 100g onions celery stick,
• basil handful,
• 1 tbls sugar,
• 2 tbls white vinegar,
• olive oil,
• 50g roasted pine nuts,
• 1 small zucchini,
• 1/4 each coloured peppers, green, red, yellow.