Beers are broadly divided into two categories: top-fermented ales and bottom-fermented lagers. Stouts are a type of ale that uses slow-fermenting yeast that evolved out of the porter style. Stouts tend to be thicker, darker, opaque beers with higher specific gravity - similar to milk. They are usually less bitter than other ales, and typically exhibit tones like chocolate, coffee, oatmeal, and milk.
Foods that are sharp can scratch the tissue, leading to discomfort. Spicy foods or foods that are extremely hot or cold can also cause the roof of the mouth to become damaged, leading to swelling or pain. Tobacco use can also damage the tissue, leading to discomfort on the palate.
Having such a taste in your mouth can also be caused by medication or by a physical condition which triggers an upset in your body chemistry. Bleeding gums is the most common cause of a metal taste. common cause is from bleeding, because the pigment in red blood cells contains iron. If you bite your tongue by accident, suffer trauma to the mouth, or have gum disease which can cause spontaneous bleeding from inflamed gums, then you will likely have a metal taste for a while, or notice it now and again.