Black Firesand

Nothing in this list is craftable in turn, so one Black Firesand is a single step: 7 units of material drawn from 3 base items, plus 3 crystals.

That bill outweighs 4,963 of the 13,602 recipes tracked here and 980 of the 1,591 Alchemist ones, and 9,374 recipes nest deeper.

All 3 raw materials are gathered, and not one of their spots is timed, so nothing in the tree waits on the Eorzean clock.

Black Firesand is itself consumed by 37 further recipes, spanning three of the eight crafting classes.