Spaghetti with zucchini and cheese

Ingredients

• 375 gram spaghetti
• 60 gram butter, chopped
• 2 tablespoon olive oil
• 1 onion, chopped
• 3 garlic cloves, crushed
• 1/2 teaspoon dried chilli flakes
• 2 cup grated zucchini (3 medium zucchini)
• juice and finely grated zest 1 lemon
• 1/4 cup chopped parsley
• 1/2 cup grated parmesan cheese
• crispy crumbs, to serve