Several ways to get there, cold turkey, or work down to one.
OMAD is technically only one meal a day, BUT individual results vary. WHen I finish the meal with a sweet, like pie, I get car cravings, so nosweets or high carbs for me. APparently others can have the high carb item.

If OMAD is not for you, then perhaps just 2 meals, with in a short span of 6 hours, that allows a period of time for ketosis, IF your meals are composed carefully. Binge eating for 2 meals with breads, pasta, etc is not the way to go. Eat clean meats and low carb vegies for the most part.