How or in what way can I know that a restaurant serves halal food? What to do when living in a non-islamic country?

My method is basically to just ask a worker in the restaurant if the food is slaughter according to Islamic laws, and then I eat. But I often choose a place that some of my mo’minin friends eat at.

What is your suggestion?

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If the owner of the restaurant is Muslim then you can consider the food to be halal. If the owner is non-Muslim you need to be confident that the meat is halal. If the worker tells you it’s halal and that gives you certainty it’s halal then you can eat there. Otherwise you cannot.