Indicates an action that has just been completed; 'freshly', 'just'.
Long explanation:
The ~たて grammar point is used to express that an action has just been completed, and the result or condition is still fresh or new. This grammar point is often used with verbs like 焼く (yaku - to bake), 料理する (ryouri suru - to cook), or 洗う (arau - to wash).