The video shows a person cutting an onion on a cutting board. The person uses a knife to cut the onion into slices. The cutting board is placed on a countertop, and there are other objects visible in the background. The person's hands are visible as they cut the onion, and the knife is seen moving back and forth as it slices through the onion. The onion is purple in color, and the knife is silver. The person's movements are steady and precise as they cut the onion into even slices.