すみません、このお料理、ソース抜きにできますか？ — Excuse me, can I get this dish without the sauce? (Restaurant · Ordering, Formal — to staff, JLPT N4)

Gesture & etiquette

Point to the dish on the menu, then make a 'no' gesture with your hand.

Be aware that some dishes are pre-made or require sauce for preparation, making this request difficult or impossible. Be prepared for a polite refusal.