Answer: Longans are not keto, as they're too high in carbs.
Longans are a small, sweet fruit native to China. Ther name literally means "dragon eye" because when the fruit is cut in half, the white flesh of the fruit and the dark seed resemble an eye. Longans are close relatives of lychees.
Each serving of longans (26 longans) contains 12.7 g of net carbs. Unfortunately, that's a bit too high to be appropriate for the keto diet.
Unfortunately, only a few fruits have a low enough carb count to fit the keto diet. If you're dying for some fruit, berries tend to be your best bet. Here are a few keto-friendly options:
Although it may not spring to mind when you think "fruit," avocados are the most keto-friendly fruit you can find. They're high in healthy fats and have a low carb profile, making them ideal for keto.