A restaurant with a toddler
Look for a plain food they already eat: rice, bread, potato, fruit. Order that, even if the rest of the table orders something else.

Order the yes
Bring a small backup if you know the menu is a guess. A restaurant is a noisy place to meet a food for the first time.
Plain rice, bread if wheat is fine, or fruit they know will do more than a children’s platter of new shapes.
Allergies in a loud room
Tell the server the allergy before the food arrives. Cheese and yogurt stay off when milk is an allergy, including as a garnish.
If you cannot tell what is in a dish, skip it. A skipped dish is safer than a guess.
The length of the meal
They may be done before the adults are. Let them be done. A familiar snack in your bag can cover the wait.
Watch them while they eat. A restaurant is not the place to look away from a food that is easy to choke on.
A sentence you can say
“We’ll get the rice you eat at home.”