Peel zucchini into large noodle size (fettuccine) slices (until reach middle).
Put butter in fry pan and saute minced onion for about 2 minutes. Then add zucchini noodles (and more butter, if soaked up). Sprinkle in some Parmesan cheese, salt, pepper, and all purpose seasoning.
Saute for about 5 minutes until zucchini is tender.