Tuna cannelloni

Ingredients

• 1 kilogram kumara, peeled, chopped
• 1 425 gram can flaked tuna in springwater, drained
• 1 270 gram jar char-grilled capsicum, drained and chopped
• 1 celery stalk, finely chopped
• 2 cloves garlic, crushed
• 1 700ml passata, plus water to fill
• 1/2 cup fresh basil leaves, plus extra to garnish
• 1 200 gram packet instant cannelloni tubes
• 1/2 cup grated parmesan cheese
• olive oil, salad, to serve