The best spaghetti bolognese recipe

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• 1 tbsp olive oil
• 4 rashers smoked streaky bacon(finely chopped)
• 2 medium onions(finely chopped)
• 2 carrots(trimmed and finely chopped)
• 2 celery sticks(finely chopped)
• 2 garlic cloves(finely chopped)
• 2 sprigs rosemary leaves(picked and finely chopped)
• 500 g beef mince
• 800 g plum tomatoes(tinned)
• 1 small pack basil leaves(¾ finely chopped and the rest left whole for garnish)
• 1 tsp dried oregano
• 2 bay leaves
• 2 tbsp tomato purée
• 1 beef stock
• 1 red chilli(deseeded and finely chopped (optional))
• 125 ml red wine
• 6 cherry tomatoes(sliced in half)
• 75 g parmesan(grated, plus extra to serve)
• 400 g spaghetti
• 1 crusty bread(to serve (optional))