How to Select Grapefruit
Select grapefruit that is round and heavy for its size with smooth skin. Avoid heavily dented or bruised grapefruits. A light hollow sounding fruit is not going to be juicy, the heavier the fruit the juicier it will be and typically the sweeter it will be as well. Grapefruit that is all yellow will be more bitter so select grapefruit that has a red tinge to the skin.
How to Store Grapefruit
Whole grapefruit can be stored at room temperature for up to a week, but to extend the shelf life, store them in the refrigerator crisper for 2-3 weeks.
Peel the grapefruit and divide it into sections. Remove as much white pith as possible as well as all seeds and membranes. Place the grapefruit in a plastic freezer bag and store in the freezer.
You may also freeze grapefruit in syrup. In a saucepan bring to a boil 4 cups of water and 2 ¾ cups of sugar mixing until the solution is clear. Cool the syrup and then pour it over the grapefruit. Place the grapefruit and syrup in an airtight container or freezer bag and place in the freezer.
How to Ripen Grapefruit
The longer a grapefruit remains on the tree the larger and sweeter it becomes. Once it has been picked it will not get any sweeter or ripen further.