A Muslim must exercise precaution in Halaal and Haraam. The food must be 100% Halaal according to the standards in Shari?ah.
In principle, if a non-Muslim informs the food is Halaal, his information is not acceptable in Shari?ah. The information of a reliable Muslim knowledgeable in issues of Halaal and Haraam is acceptable. If the food offered by a non-Muslim is, for example, vegetarian, then too the fear of contamination with Haraam is still there. It is therefore against caution to eat from non-Muslims.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai