I am familiar with a Passover seder, but what is a Tu BiShvat seder?
Tu BiShvat (Hebrew for the 15th day of the Hebrew month of Shvat) is the new year of the trees.
Why do we celebrate Tu BiShvat, the Jewish “New Year of the Trees,” in the middle of winter?
Tu BiShvat, called the "New Year of the Trees," falls at a seemingly incongruous time of year.
Seder plate
A plate that holds ritual foods used throughout the Pesach (Passover) seder. Each item on a seder plate is a symbol of the Exodus story and helps participants at the seder retell the story each year.
Yachatz
“breaking.” A step of the Pesach (Passover) seder when a whole piece of matzah is broken in half. The larger half is set aside as the afikoman. Often younger participants are involved in a game of “find the afikoman.”
Z’roa
Literally, “bone.” It is customary to place a shank bone on the seder plate as a reminder of the Passover sacrifice in Temple times.
afikoman
"Dessert" (Greek); matzah is the official "dessert" of the Passover seder meal. During the seder, the children traditionally "steal"and hide the afikoman, and it must be redeemed by the seder leader.
chameitz
Foods not eaten during Passover. Chameitz typically includes leavened bread or any food that contains wheat, rye, barley, oats, or spelt, unless production has been supervised to ensure that it has not leavened.
charoset
A mixture of fruits, nuts, spices and wine eaten as part of the Passover seder. Its color and consistency reminds us of the bricks and mortar used by the Israelite slaves.
chol hamo-eid
"Secular part of the occasion;" during Passover and Sukkot, the intermediate days of the festival.
Elijah's cup
A special cup used during the Passover seder to symbolize Elijah, who symbolizes the coming of the Messianic age.