One should use the time between Mincha and Maariv to recite Tehillim.
Many times, the Rebbe would begin the Nigun of Avinu Malkeinu before Maariv.
Maariv is davened at greater length and concentration than usual, as it is the first Tefillah of the year.
L’Dovid Mizmor: It is not Chabad custom to open the Aron Hakodesh, nor to recite it verse by verse after the Chazzan. [The Rebbe Rashab states that one’s intention at this time creates a “vessel” in which to draw down Gashmiyus for the whole year.]
On the first night, we greet each other L’Shana Tova Tikasev V’Sechasem. [The grammar is applicable for greeting a male. One may use gender-appropriate grammar when greeting a female; i.e. L’Shana Tova Tikasevee V’Sechasemee.]
After the first night of Rosh Hashana, we greet each other Gmar Chasima Tova.
A woman who needs to recite Kiddush should not say Shehecheyanu, as she already did so at candle-lighting.
From Rosh Hashana until Hoshana Rabba (inclusive), we use round Challos, and we dip it (three times) in honey.
Apple and honey is eaten after the Challah, before the first course. The apple is sliced and dipped three times in honey. Borei Pri Ha’etz is then recited while holding the apple in one’s right hand, followed by the Yehi Ratzon, before eating the apple.
When one recites Borei Pri Ha’etz, he should clearly have in mind that the Brocho includes any fruit served during the meal and at dessert. He does not make a new Brocho at the time of dessert.
Pomegranate is also eaten on the first night. It should be present at the table when the Borei Pri Ha’etz is said on the apple, and should be eaten after the apple. [If the pomegranate is a new fruit, it should be present on the table during the Shehecheyanu of Kiddush, and one should have it in mind at that time.]
It is customary to eat fish, the head of a ram (or fish), as well as Tzimmes.
On Rosh Hashana, it is appropriate to consume meat, sweet food and drink. It is customary not to eat any foods that are bitter, sour, overly sharp, vinegary, or that contain nuts.
