the.com/bittersweet
The flavor of getting exactly what you wanted and missing it already.
means Describing something that mixes pleasure and pain, where joy and sorrow refuse to take turns.
from Old English biter plus swete, a literal taste-test for plants both poison and tonic, long before it described feelings.
Real plantBittersweet nightshade is a genuine toxic vine.
Chocolate gradeBittersweet is sweetened dark chocolate, near 70 percent cocoa.
Shakespeare-adjacentPoets weaponized the word for love centuries early.