Quinoa, a grain-like crop grown in South America, is not one of the grains considered chametz (wheat, barley, rye, oats, spelt, or their derivatives). Some medieval Ashkenazi rabbis ruled that kitniyot (legumes) could not be eaten during Passover because they could be confused with chametz products. Some authorities consider quinoa to be kitniyot, while others do not.
In the book of Numbers (15:38-39), we read that the Israelites were instructed to "make for themselves fringes on the corners of their garments…that they shall look at it and recall all the commandments of the Eternal and observe them..."
The Hebrew word seder means “order” and refers to the religious service and festive meal observed in Jewish households on Pesach.
The shank bone symbolizes the paschal offering brought to the Temple in Jerusalem in ancient times.
The Torah tells us (Exodus 12:15-16) to observe Passover for seven days and that the first day and seventh days will be a "sacred occasion." (Yom Tov)