Surely caraway is not threshed with a sledge, and the wheel of a cart is not rolled over the cumin. But caraway is beaten out with a stick, and cumin with a rod.
Jewish Publication Society of America Version (JPS1917) - Isaiah 28:27 >For the black cummin is not threshed with a threshing-sledge, neither is a cart-wheel turned about upon the cummin; but the black cummin is beaten out with a staff, and the cummin with a rod.