Sylvanas liked ground coffee from a unique land within azeroth in life.
In her undeath she preferred dark coffee, obviously.
This was all before she married Jaina. She now prefers Kul'tirian coffee, which she tried on their honeymoon in Tiragarde, and she fell in love with it!
They get their brand of Kul'tirian coffee shipped from their favorite coffee place in Boralus (for free, of course) since Cyrus offered to pay for their shipment while they enjoyed their time together as newlyweds.
When Alleria and Vereesa would come to visit, the two newlyweds always gave her coffee if Syl's sisters had to travel far to meet them. The youngest Windrunner isn't a fan of their coffee at first, but she grew to like it while Alleria fell in love with it instantly.
As per agreement to expand Boralus' shipping and travel; Quel'thalas would occasionally exchange goods with the fine people of Kul'tirias to show how much they see Jaina as one of their own people.
Lor'thermar always sneaks in an extra something within each crate of weekly shipment of goods as a token of his favor and respect Kul'tirias as a nation.
Kathrine would occasionally write to the two while they were away, as would Derek and Tandred. This goes double for when Sylvanas and Jaina sail together after the birth of their first child, Daelin Windrunner, which Jaina had decided to take Sylvanas' last name when they married.
Sylvanas would occasionally be welcomed in stormwind as an honor guest to Anduin, who had long since took the throne from her brother-in-law, who offered him his throne back upon Anduin officially returning his to self imposed exile after what happened in shadowlands.
When Sylvanas first visited Stormwind with Jaina, she initially got cold looks and the occasionally shout of unwelcome threats from its citizens which she gotten used to since the very same thing happened when she ventured to Kul'tirias so Jaina could announce her engagement to Sylvanas properly.
She was met the occasional death threat from both times within the two cities, but she couldn't blame them. After all, she did almost destroy both cities as Warchief as well as gotten Varian killed (as stormwind views it).
With enough time, Sylvanas proved herself to both lands that she had truly changed. But Genn was still occasionally glaring at her with such hatred within the union as well as banquets held to welcome Jaina and Sylvanas.
When the old wolf would privately threatened her away from the ears of Anduin and Jaina, she would all but take the words that he spat at her with sterness as well as watching her tongue (for once in her undead life..) if Anduin or Jaina came towards them, Greymane would act as if he was having a friendly conversation with her. Jaina, having felt Sylvanas emotions from a distance via necklace she had proposed to her with, she would know better when Syl tried to brush it off.
Upon learning what had transpired , Jaina was going to leave to put Greymane in his place, but Sylvanas would always lovingly hold her hand while whispering not to cause a scene.
The two would touch foreheads and speak in Thalassian to each other, which Jaina already knew how to speak fluently.