Sauces are liquid components that add flavor, texture, and visual interest to dishes. Common thickening agents for sauces include roux, slurries, beurre maine, and liaisons. Bechamel is a white sauce made with white roux and milk that originated as the sauce of King Louis XIV's chief steward. Veloute is a light blond sauce made with blond roux and white stock. Espanole or brown sauce developed in the 18th century from finest Spanish ham and tomatoes thickened with brown roux. Tomato sauce can be thickened with butter roux in traditional French cuisine or associated with Italian cuisine. Hollandaise is an emulsified egg yolk and butter-based