The exotic and beautiful dragon fruit is also called pitahaya. Some of them are a bright, hot pink color. They’re in season now. rworange says to select those with a shiny, thin skin. A ripe one will have a little give, like a slightly ripe avocado, adds chocolatetartguy.
When ripe, they’re wonderfully sweet. Just peel them and eat.
Here’s more info, with a good picture.
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How to eat dragon fruit?