How to buy fruits
This page shows how to choose sweet fruits without tasting them in a shop or on a market.
First, watermelons should be filled-out with spherical or cylindrical shape. A watermelon that has the shape of an eggplant indicates some trouble during growth---possibly a lack of water. A lack of water will have a negative effect on taste. Second, the surface structure pointed out by the arrow in the image below is a sign for sweetness. Third, if you see a watermelon cut in half, big cracks in the flesh also indicate sweetness.
In June 2010, Trader Joe's in Simi Valley had a blackboard with a nice, concise description on how to pick watermelons.
If you want to buy sweet apples, look for the type of surface structure marked in the image below.
© Su-Chen Wang and Heiko Hoffmann