Where can I see an example code for introducing data into a trained neural network for their classification on TensorFlow?

Question

Neural networks

Initial information.
With the help of TensorFlow, I made a neural network that classifies culinary recipes. Each recipe consists of ingredients that are translated into vectors using NLTK. The database contained recipes from only two countries. The classification accuracy on our own toy database of recipes was 0.8.
Problem.
I can't figure out the code for introducing a third-party recipe vector to find out which of the two countries it belongs to. I would be grateful for any tip where to look at such an interface. Thanks in advance.