Grapefruits are an excellent source of vitamins A and C, potassium and lycopene (especially pink and red grapefruit), plus they're low in calories. Fresh grapefruits are available in the produce section of the grocery store or you can buy grapefruit juice in bottles and cans. Grapefruit is a nice accompaniment to standard breakfast fare, but that doesn't mean you can't enjoy a grapefruit as a mid afternoon snack. Plain grapefruit is tasty, but a little on the tart side, but just a tiny bit of sweetener can fix that. Grapefruit ideas: Slice a grapefruit in half, place the halves skin-side down on a baking sheet and sprinkle a little brown sugar on top of each half. Place in the oven under the broiler for a couple of minutes until the sugar melts and starts to bubble. Place sections of grapefruits and oranges in a bowl and drizzle honey over the sections. ive it a quick toss and serve as a simple citrus salad. Drink 100% grapefruit juice as an alternative to other fruit juices that are higher in calories.