From the source:
 
So here’s the first featuring Agate Quartz x Apple Syrup, the lovey-dovey couple of cooks. They eat more of what they cook than the people who they are supposed to be cooking for.  
These two have always been the dorkiest couple, even when they confessed their love for each other it couldn’t have been more silly (and they needed a push from Pan and Harmony). They aren’t usually aware of their affection in public unless someone points it out, primarily their friends.  
They are constantly holding hands or snuggling, mostly Agate because for him Apple Syrup is his treasure just like jewels are a dragon’s most prized possession. And Apple Syrup is so upbeat and carefree that she doesn’t mind the affection at all.