How do you judge Bosc pears?
They don't really soften when ripening, nor do they get really fragrant. It's just been hit or miss with me - but is there a method to judge sweetness or ripeness?
They will soften somewhat, but not as soft as an Anjou pear. You should be getting a nice aroma of sweetness from the Bosc pears when ripe.
Bosc pears don't really ripen after being picked; they simply get softer.
So when buying them, look for ones with a nice dark skin and a good aroma.
Check near the stem because pears ripen from the inside out. It should be softer than the rest of the pear and it should have a pear fragrance. You can put them in a paper bag with a banana for two days and they'll certainly ripen.