So in one of my kyalin fics, I mentioned that Lin and Tenzin had this „sorry tart" and I want to talk about it bc I'm currently drowning in cute linzin thoughts
When they were teenagers Lin used to be obsessed with a strawberry tart. She'd eat it whenever she had a chance and Tenzin of course, noticed it because almost every time he saw her eat; it was a strawberry tart.
Once, they were discussing Su and Lin after a fight. Tenzin was slightly defending the younger Beifong what cause Lin to snap at him and storm out of the Island. She didn't talk to him for a week but once he realized that he fucked up he bought Lin her favorite strawberry tart and showed up at her door. Lin was still pissed but the fact that Tenzin remembered what was her favorite pastry (although it wasn't something hard to remember, literally everyone knew she loved it) melted her heart down and she just couldn't accept the apology.
After that event, Tenzin would buy the strawberry tart every time he needed to say sorry to Lin what became their inside joke.
And now, going into my fic that you can find here:
Years after linzin breakup Bumi and Korra got Lin pissed because they acted like idiots and when they wanted to say sorry they asked Tenzin what to do since he was probably the person that was apologizing to her the most. He told them to just get a strawberry tart and say they're sorry, knowing Lin would figure out he was involved and hoping to maybe make her laugh. Of course, Lin knew that it wasn't a coincidence what ended up lighting up her mood and made her go easier on the two that got her mad earlier.
Summing up, linzin remembering inside jokes from the times they were close after they kind of made up would be hella cute