My friend is Pure Vegetarian,but after having lunch in a hotel he came to know..

I think there's always going to be a small amount of cross-contamination. If your lucky, it will be very little. The truth is that we vegetarians (yes, I am a vegetarian) usually don't care about the cross-contamination. For example, while a lot of meat and non-meat food is packaged in the same company's warehouses - and so on the product package it will say "may contain trace amounts of..." or "packaged in same area as...". The truth is, most vegetarians will NOT die if they eat a fraction of an ounce of meat or animal-derivative. The main point of being vegetarian is that your intentions are in the right place, and that you're not consuming in meat or animal derivatives - meaning that you're almost BOYCOTTING buying meat, and therefore demand goes down, and then so does supply (and so less animals get killed). A lot of people think in these circles.