If you'd like to garnish with a full strawberry, simply cut a slit halfway down the strawberry from the tip down towards the stem. Line the slit up with the rim of the drinking glass and gently slide the strawberry onto the glass. Similarly, you can do this with sliced strawberries by first slicing the strawberry into thin rings, then cutting a slit in one side of the strawberry ring to allow you to slide it onto the rim of the glass.