Stilton and pear is the blue cheese set against sliced fresh fruit, and the sandwich lives on the ripeness of that pear. The constant underneath is the same salty, sharp, crumbling Stilton; what makes this version itself is thin slices of fresh pear laid through it, often on a walnut-studded brown bread that the pairing has long kept company with. The defining fact is the bleed. A pear at the right ripeness is grainy, perfumed, and faintly wet, and bitten against a mouthful of saline crumble it does not snap like an apple, it gives way and releases a soft sweet juice that floods the salt and softens the cheese's edge. The sandwich is built around that yielding sweetness rather than the cheese alone.
The craft is choosing and cutting a fruit that is working against the clock. The pear has to be ripe enough to be fragrant and to bleed, because an underripe one is hard and flat and brings nothing the cheese needs, and overripe it collapses to mush that soaks the bread. It is sliced thin so it folds to the cheese rather than sitting on it as a slab, and it is cut close to assembly because exposed pear browns and weeps fast. The Stilton goes on as crumble pressed into firm butter, the butter tacking the rubble and rounding the brine in its usual structural way, and the walnut bread, when it is used, is not incidental: its tannin and grain echo the nut note the pairing wants and give a soft cheese a crust with some chew to push against. Assembled near to eating, it holds; built too far ahead, the pear gives the build away.
The variations are the cluster of single counters against the constant blue, and this fruit has more than one reading. A cool halved grape replaces the soft bleed with a sharp juicy burst. A bitter walnut on its own answers the salt with tannin and crunch rather than sweetness. A poached or roasted pear deepens the fruit into something jammier, and the cheeseboard-on-a-plate version turns the same components into a course rather than a sandwich. Each deserves its own article rather than being crowded in here.