Nagataya Hiroshima style okonomiyaki shop is in a great location, right on the end of Hondori, directly next to Peace park. They have hot plates on tables as well as the main one if you want to keep it hot. They also clearly understand vegetarian diners as well as the needs of diners with allergies as they will offer to cook with vegetable oil instead of lard and have an alternative allergy-free sauce you can buy to use with your meal.
However, because this is such a great place at a great location, you can usually find a line of customers waiting outside this shop most days. There is seating for almost 40, so the line moves quickly, but if you are not the patient type, you should plan to go outside of popular meal times as they don’t take reservations.