Their name gives a strong clue as to what one might do with the deliciously bitter-tangy-sweet juice from these plump grapefruits, but you can enjoy them for your breakfast as well! Cocktail grapefruits, also known as "mandelos" come from a mandarin-pomelo cross and bring you the best of all worlds! They're a sub-acid fruit, so they bring the sugars and slight bitterness of your standard grapefruit, but without all the tartness!