Used to describe food or drink that has been made sweeter.
El café fue endulzado con miel, lo que le dio un sabor especial.
The coffee was sweetened with honey, which gave it a special flavor.
El café que me preparó estaba endulzado a la perfección, justo como a mí me gusta.
The coffee she made for me was sweetened to perfection, just the way I like it.