。
Take the flat pan off the heat.
Literal
Flat-pan [object-を] fire [from-から] lower [polite imperative-なさい].
平なべ is 'flat pan/skillet.' 火からおろす means 'to take off the heat' — 火 (fire/heat) + から (from) + おろす (to lower/remove). A practical cooking instruction using ~なさい.