Restaurant recommendations (allergy)

Hi! Looking for restaurant (and general food) recommendations in Osaka and Tokyo.

I have a tree nut allergy (peanuts/coconuts OK, everything else is not OK), and was wondering if anyone had any recommendations for restaurants that don’t use those and/or can accommodate the allergy. I figure sushi and ramen restaurants are likely not going to have that issue, but am hoping to have more than just that on the trip.

Also, if anyone has tips on how to communicate the allergy to restaurants or places/foods to avoid, that would be useful too! Thanks!!