No. The wine is an intrinsic component of the wedding, being associated with the group of seven blessings recited under the canopy during the ceremony. But the wine is not understood as beginning a meal at that time. The conclusion of the ceremony is typically followed by a festive meal that begins with the blessing over bread, often recited over a large, ornate challah.
Challah is not served at Jewish weddings.
Challah is Jewish bread.
Challah is a braided loaf of egg-bread.
Challah.
Challah.
Do a Google search of What Is The Origin Of Jewish Challah Bread. The top result is a Wikipedia article on that subject.
about $2.25 at the Jewish bakery
It's known as a Shabbat Challah Cutter.
There are no "signs" in a Jewish wedding.
The sabbath is an everlasting covenant between the Jewish people and G-d. A part of its observance is to enjoy the day. Meals eaten at night, during the morning and late afternoon are all part of its observance and enjoyment.
If you are referring to challah, it is made from: flour, eggs, water, oil, yeast, sugar, and salt. If you're referring to matzah, it is made from: flour and water There is also matzah that has egg in it or apple juice.
I think you're asking about "challah". It's a Jewish bread eaten during Shabbat.