To blanch. This term means to lightly cook raw ingredients for varying amounts of time in boiling water, with or without salt and vinegar. The ingredients are then refreshed in cold water It also means to cover with boiling water for a few seconds to facilitate peeling. Tomatoes, peaches, almonds and pistachios can be treated in this way with no damage to the flesh. This also means to whisk egg yolks and sugar until foamy.