Spaghetti bolognese with butternut squash

Ingredients

• 1 tablespoon olive oil
• 1 large onion, finely chopped
• 2 cloves garlic, finely diced
• 200g lean minced beef
• 1 x 400g can chopped tomatoes
• Half a butternut squash, peeled, deseeded and cut in to 1cm cubes
• 2 medium carrots, peeled and grated
• 1 teaspoon dried mixed herbs
• Freshly ground black pepper
• 400g wholewheat spaghetti (or any other pasta)