The Tartine au Miel is the breakfast slice topped with honey, and honey behaves on bread unlike anything else this family uses. One slice, a layer of honey, eaten in the morning with coffee or with chocolate. Where jam sets and sits where you put it, honey is liquid at room temperature and wants to move: it runs to the low points, finds the open holes in the crumb, and soaks downward the longer it sits. The whole character of this tartine is a negotiation with that behavior, which is what separates it from the Tartine Confiture and the rest of the morning slices that use a topping content to stay still.
The craft is in managing the run, and the bread does most of that work. A tight, close crumb resists the honey long enough to keep it on the surface where you can taste it as honey; an open, holey crumb drinks it straight down and the slice goes sticky and damp. A film of butter spread first slows the descent and gives the honey something to sit on, which is why the buttered version holds longer than the bare one. The honey itself sets the flavor: a pale acacia stays mild and clean against the wheat, a darker chestnut or forest honey turns resinous and almost bitter at the edge, a thick set honey behaves more like jam and stays put where a runny one will not. The slice is best within a few minutes of being spread, eaten before gravity wins and the honey reaches the crust.
The variations are the rest of this family, each the same slice with one topping changed for one occasion. Swap the honey for jam and you have the Tartine Confiture, or with butter underneath the canonical Tartine Beurre-Confiture; take the topping away and it is the plain Tartine Beurrée the morning starts from. Move to the afternoon and the slice takes chocolate or a chocolate-hazelnut spread for the goûter instead. The honey changes with the flower and the region it came from. The Tartine au Miel sits in the open-face tradition the catalog groups under Tartine, and its specific contribution is a topping that moves, which makes the bread's tightness the thing the slice depends on.