Since everyone should receive pieces of the both the top and middle matzot, but must also eat a specific amount, other matzot may be used to supplement. The k'zayit of matzah should be completely eaten in a short period of time. Therefore, one should not leave the k'zayit of matzah to nibble at it through the rest of the meal. Maror - A blessing is said, and the bitter herbs are dipped in charoset and eaten. We do not, however, eat the maror alone, but temper it with a small amount of charoset.
Some people have the custom of dipping the maror in charoset and then shaking the charoset off.
One may look at this mixture of the bitter herb, a reminder of slavery, with the sweet charoset as symbolic of the fact that not all that one considers bitter lacks sweetness, and vice-versa. It was only through the bitterness of slavery that the Jews were able to recognize and accept the freedom inherent in the Torah and to unite into one nation. Koraich - A sandwich is made with the matzah and the maror. When the Holy Temple stood in Jerusalem, Jews came from everywhere to participate in the Passover offering as part of their Seder. Including charoset in the sandwich is not a universal custom.