As if you were buying fresh flowers, buy them in anticipation of a need. An unripe Packham will take from 3 - 8 days to ripen at room temperature (turning yellow when ripe). Look for pears free of blemishes and cuts. Choose those that are fragrant, without any soft spots.
Note: If peeled, the pear's salicylate levels drop to safe/negligible amounts.
Store at room temperature until they give to slight pressure. It is best to turn pears occasionally while ripening. Refrigerate ripened pears and use within three or four days. Avoid stacking pears on top of each other.
Tips & Tricks:
To check for ripeness gently squeeze at the stalk end to feel for some give.
Packham pears are also good to cook with. Serve with spinach, in a salad or with walnuts and blue cheese. Poach with cinnamon in lemon juice and pear concentrate.