Right before granting his fateful blessings, Isaac partakes in a meal that is deeply ceremonial and spiritual. Rather than satisfying a basic physical need, this eating and drinking serves as a religious and mental preparation, readying his heart to bestow the blessing. His request to be served is formulated as a semi-ceremonial declaration [ביאור שטיינזלץ]. The act of eating is performed with a focused, elevated intention, much like a priest offering sacrifices. Isaac eats to align his thoughts with his actions, turning a simple physical activity into a spiritual vessel capable of channeling the blessings [מלבי״ם].
During this meal, Jacob serves his father wine. The primary approach among commentators is that the wine is intended to bring joy to Isaac, allowing him to bless his son from a place of happiness and good spirits, as wine was typically reserved for special feasts during that era [רד״ק]. Additionally, the drink serves to calm Isaac and dispel his inner fears [צפנת פענח]. However, others view the presentation of wine as a calculated tactical move by Jacob. Because wine slightly clouds the mind, it ensured that Isaac would not examine his son's identity too strictly and discover that he was not Esau [חזקוני, צאינה וראינה].
The sudden appearance of wine raises a practical question, as Rebekah had only provided Jacob with bread and meat. To address this, several commentators conclude that this was miraculous wine, delivered to Jacob by an angel directly from the Garden of Eden [הטור הארוך, דעת זקנים, פרדס יוסף]. Notably, the Torah rarely mentions drinking wine in the context of goodness and blessing, with this instance and Abraham's encounter with Malki-Tzedek being the only exceptions [הטור הארוך, דעת זקנים].
On a symbolic and legal level, Isaac's meal is viewed as the consumption of a meal offering, with the poured wine paralleling the liquid libations that accompany altar sacrifices [מלבי״ם, צפנת פענח]. Furthermore, some identify this specific feast as the Passover Seder. In this light, the wine serves as a remembrance of the traditional four cups, and the meat Jacob serves is eaten as the Passover sacrifice, which functions as the Afikoman. Jacob acts with profound wisdom here: since it is forbidden to eat anything after the Afikoman, Isaac would be legally prevented from consuming the game Esau would bring him later [פרדס יוסף]. Finally, on a mystical level, serving the wine represents the transmission of the deep secrets of the Torah to Isaac [שפתי כהן].