Personally i havent tried liq-nitro on food or beverages.
but as i know gamit sya sa foood processing like ice cream but not directly dipping the creame.
The only thing iam sure about is, if you dip food in Liquid nitro it will freeze instantly and if you dip it for too long it will crack or break into small bits na hindi na mapapakinabangan. Also consider na pagmasyadong malamig Say apple didikit sa dila or sa lips ng kakain nito.
Liquid Nitrogen can cause burns on skin contact trust me on this natapunan na ko once so ingat lang, make sure complete ka ng insulated Cryo protective equipment like Gloves, apron face shield. Dispense in small amount.
The fume is non lethal basta well ventilated ang area mo.
toxicity: no known case kase liquid nitrogen quickly turns to gas from liquid.
Kung talagang kailang gumamit ka ng liquid nitrogen sa pagkain make sure meron kang another basin na may something oily like VCO or milk yun ang i dip mo sa liquid nitro then sa VCO mo i dip yung food .Quick ang action para di ma-freeze yung Milk or VCO( virgin coco)
ayon not directly dipping the food in liquid nitrogen
here are links about liquid nitrogen.
http://www.matheson-trigas.com/msds/00202589.pdf
http://www.physik.uni-augsburg.de/~ubws/nitrogen.html