when i had trouble eating an amount of food that made me feel full due to anorexia i used to make myself something like a sandwich and take a bite every 15mins or so .
it would take me like 3 hours to eat but i never felt full which is what triggered me to restrict i still graze now so i always have foods i can eat on the go or that wont go off if it takes all day to eat.

the things i found ok to eat were grapes, oat/rice bars, breakfast cereal , rich tea biscuits and smoothies

not the same situation but it helped me.