The Wensleydale sandwich is built around a cheese that refuses to dominate. Wensleydale is a pale Yorkshire cheese, crumbly rather than firm, mild, with a faint honeyed sweetness and a clean acidity that fades fast on the tongue. The defining fact of the sandwich is that quietness. Where a mature Cheddar fills the mouth and a Stilton announces itself, Wensleydale stays light and short, so the whole build has to be arranged to let a gentle cheese carry the sandwich rather than be buried by it.
The craft is the cut and the restraint. Wensleydale does not slice into clean sheets the way a firmer cheese does; it breaks and crumbles, so it is laid on in a generous, loosely packed layer thick enough to register against the bread, because shaved thin it simply vanishes. Butter is structural here as much as flavour, spread to the edges to bridge a dry, crumbly filling to the crumb and to stop the sandwich reading as bread then a faint trace of cheese then bread. The bread is plain soft white or a light wholemeal, deliberately understated, because a cheese this mild has no margin to fight an assertive loaf and any strong condiment would simply erase it. The discipline is to add almost nothing and let the cheese be the point.
The variations are about what counter, if any, you allow. A thin scrape of a mild pickle or a little apple gives the cheese a sharp edge without overwhelming it; the well-known Wensleydale and cranberry pairing makes the tart fruit the defining note instead of the cheese; a wedge set against pickle and bread on a plate becomes a ploughman's. Each deserves its own article rather than being crowded in here.