I was interpreting for my friend while I was in the Ukraine.
While we were in a restaurant he wanted a salad with only "tomatos" and "cucumbers" and I did not know either word. It was rather embarassing not to know such simple words. For all you future interpreters out there, here are some essential words.
pear = груша
peach = персик
cherry = вишня
cucumber = огурец
tomato = помидор
greens = зелень
lettuce = латук
mushroom = гриб
olive = маслина
raisin = изюм
grape = виноград