Honey and walnut is the sweet sandwich with the crunch deliberately put back. The plain honey build and most of its relatives share one weakness, a filling that is all soft sugar with no texture of its own, and this is the version that solves it by folding chopped walnuts into a base of cream cheese sweetened with honey. The defining component is the walnut. It is the only thing in the sandwich that the teeth meet rather than slide through, and without it this is just a sweet cream cheese spread with nowhere to go. The cream cheese is doing structural work the honey alone could not: it carries the sweetness, holds the nuts in place so they do not roll out of the sides, and binds tightly enough that the filling stays put rather than weeping into the crumb the way loose honey does.
The craft is balance and the register the sandwich sits in. Honey and walnut against soft cheese is the flavour of a tea loaf rather than a child's jam sandwich, faintly savoury at the edges from the cheese and the slight bitterness in the walnut skin, and that bitterness is the thing that keeps the honey from reading as cloying. The cheese is spread to a layer thick enough to grip the nuts but not so thick it slumps; the walnuts are chopped rather than left in halves so each bite carries a few rather than meeting one whole and missing it elsewhere. The bread is soft, often brown, because a wholemeal note matches the loaf register the filling is reaching for, and butter under the cheese is optional here since the cream cheese is already fat enough to seal the crumb.
The variations move along the same tea-table line. Date worked into the cream cheese pushes it further toward a tea loaf; a thinner brown bread trimmed crustless turns it into an afternoon-tea finger; raisin bread under it leans the whole thing sweeter still. Each deserves its own article rather than being crowded in here.