Poached pears are a make-ahead dream: a dessert as good cold out of the fridge as warm out of the pot. Make sure the pears are firm, not mushy, certainly with no brown spots — maybe not the best for eating but a little harder and so better able to stand up to the pressure.
To prepare the pears, cut off the stem ends by about 1/4 inch to get rid of the woody bits in the flesh. Peel the pears, then cut them in half through their former stem ends. Use a melon baller to scoop out the seeds and their fibrous membranes in the middle of each half. If you don’t work quickly, the peeled and cut pears can brown. To stop that, drop the prepared pear halves in a bowl of cool water mixed with the juice of 1 lemon as you prepare the remainder of the pears.