Cheese

This recipe will also make four 16-ounce servings; divide filling amounts accordingly.

Bosc pears must be very ripe; Anjou, which are juicier, can be slightly firm. Avoid enamel baking dishes, as they cause the syrup to burn.

For the creamiest results, allow the mascarpone to stand at room temperature for 15 minutes before serving.

Chihuahua, Cotija, and Mexican crema give the dish authentic flavor, but Monterey Jack, French feta, and sour cream are good substitutes.

For a less formal but equally appealing presentation, you can spoon rather than pipe the filling into the shells.

You can make the polenta through step 1 ahead of time; let cool, then cover and refrigerate.