Spaghetti al limone with pangrattato

400 g spaghetti 1 garlic clove, finely chopped 199 g butter Zest and juice of 1 lemon 50 g Parmesan cheese Salt, pepper

For the Pangrattato (poor man's Parmesan):

2 large slices of stale bread 1 garlic clove, finely chopped A pinch of chili flakes 2 tbsp olive oil 2 tbsp fresh parsley, chopped Salt, pepper Zest of half a lemon