This is a classic faux-pas committed by plebs and other ill-educated cunts who will probably vote Labour in the forthcoming general election. Never turn your fork over to eat fresh garden peas.
Fresh peas, never frozen, should always be served with food which can help the use of the correctly used fork such as mash or rice. If no knife is required for the dish served then a fork may be turned over.
When eating peas with a prostitute always get her to sensually de-pod the peas with you during the meal preparation.