garnish with (something)
To ornament or embellish something with something else. Often done with food. A noun or pronoun can be used between "garnish" and "with." People often garnish ham with pineapple slices.
garnish something with something
to embellish or decorate something, such as food, with something. For the final presentation, I will garnish the dish with a sprig of parsley. The roast was garnished with slices of apple.