We Jews don't necessarily have holy food, the way that Christianity, for example has the bread/wafer and wine of the Eucharist.
Most of our holidays involve celebratory meals, though, and food and drink have a significant importance in our tradition as measures of quality of life and celebration.
Most of our holidays, and many of our lifecycle events, are inaugurated by making a blessing over a cup of wine.
On the holiday of Passover, we remove from our houses all foods with leavening or yeast, and do not eat them; and at the Passover Seder, which is both the central celebratory meal of the holiday and the central ritual of the holiday, we eat matzah (unleavened bread), bitter herbs or roots, and charoset (a kind of fruit relish made from apples, nuts, wine or grape juice, spices, and various other additions, like sundry other fresh or dried fruits, or matzah, or even sometimes peppers), which are symbolic foods deeply integral to observing the holiday.
And, of course, we keep kosher. Many kinds of animals, birds, and sea creatures are forbidden to us to eat, and those that are permitted must (except for fish) be killed be a Jewish ritual slaughterer in the proper fashion. We cannot eat meat and dairy products together: we even keep separate sets of dishes and cooking utensils for them.
