Tannins react with proteins. When paired with dishes that are high in proteins and fats (such as red meat and hard cheeses), the tannins will bind to the proteins and come across as softer. In the absence of protein from the food, such as some vegetarian dishes, the tannins will react with the proteins on the tongue and sides of the mouth—accentuating the astringency and having a drying effect on the palate. Various cooking methods, such as grilling and blackening can add a bitter "char" component to the dish that will allow it to play well with a tannic wine, while fish oils can make tannic wines taste metallic or off.[7] Astringent tannic wines like Barolo and Cabernet Sauvignon can overwhelm a lot of foods but can be softened by fatty foods with a lot of proteins such as hard cheeses or meats. The dry tannins also serve as a cleansing agent on the palate by binding to the grease and oils leftover in the mouth. Spicy and sweet foods can accentuate the dry, bitterness of tannins and make the wine seem to have off-flavors