The logo of the "little red devil on can", trademarked in 1870 by William Underwood Company, is the oldest food trademark still in use in the United States. The recipe hasn't changed much over the years. The spread is still "made from the highest quality ham, cured in its natural juices, we create the heavily sought after 'deviled' flavor through a proprietary blend of natural spices."
What has changed is Satan's sneer which is now a friendly smile. He's also trimmed his claws.