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The thickness of the rind can vary.
The fruit’s condition and internal structure also affect the sound.
So if you like tapping watermelons, there’s nothing wrong with using it as another observation—but don’t let the sound override stronger clues such as the overall condition and weight.
Don’t Judge a Watermelon by Its Beauty
This may be the most useful lesson of all.
A perfectly smooth, glossy watermelon can be disappointing.
A watermelon covered in scratches or irregular markings can sometimes be delicious.
The outside isn’t a direct window into the sugar content inside.
That’s why experienced shoppers often examine several characteristics instead of searching for one magical sign.
You’re essentially collecting clues.
Field spot?
Check.
Weight?
Check.
Overall condition?
Check.
Shape?
Check.
Stem?
Take a look.
Then make your decision.
Does Watermelon Become Sweeter After You Buy It?
This is another important point.
Unlike fruits such as bananas or pears, watermelon generally does not continue to increase in sweetness after it has been harvested.
That means choosing a good watermelon at the store really does matter.
The fruit can become softer or change in texture during storage, but that doesn’t mean it will suddenly transform from bland to extremely sweet.
So if you’re hoping to “ripen” a disappointing watermelon on the kitchen counter, don’t expect a dramatic improvement in sweetness.
This is another reason those shopping clues can be useful.
What Should You Do Once You Get It Home?
If you’re not planning to cut your watermelon immediately, keep the whole fruit in an appropriate location away from direct sunlight and excessive heat.
Once you cut it, refrigeration becomes important.
Place cut watermelon in a clean, covered container or wrap it appropriately and refrigerate it.
For best quality, enjoy cut watermelon within a few days and follow food-safety guidance for storage.
If the fruit develops an unusual smell, slimy texture, mold, or other obvious signs of spoilage, don’t eat it.
A Simple Summer Recipe
Once you’ve found a juicy watermelon, you don’t need to do anything complicated with it.
One of my favorite combinations is a simple watermelon, feta, and mint salad.
Cut chilled watermelon into bite-sized cubes.
Add crumbled feta cheese.
Tear a handful of fresh mint leaves over the top.
Gently toss everything together and serve cold.
The sweetness of the watermelon contrasts beautifully with the salty feta, while the mint adds a refreshing finish.
For an extra touch, you can add a small squeeze of fresh lime juice.
It’s simple enough for a family meal but attractive enough to serve at a summer gathering.
The Five-Clue Shopping Checklist
The next time you’re standing in front of a pile of watermelons, remember these five clues:
1. Field spot: Look for a developed creamy-yellow spot rather than relying on a very pale one.
2. Webbing: Don’t automatically reject brown, web-like markings, but remember that they aren’t a guaranteed indicator of sweetness.
3. Shape: Choose a healthy-looking, reasonably uniform fruit without major damage.
4. Weight: Compare similarly sized melons and consider the one that feels heavier.
5. Stem: Examine it as an additional clue, but don’t treat its color or dryness as a guaranteed ripeness test.
And there’s one final rule that may be more important than all the others:
Don’t look for perfection. Look for the best combination of clues.
There is no secret button you can press or magical tapping technique that guarantees a sweet watermelon every time.
But by slowing down for a few seconds and examining the fruit carefully, you can make a more informed choice.
The next time you’re shopping, don’t automatically grab the prettiest watermelon.
Turn it over.