Crabmeat Dewey is a traditional dish originating from Maryland. The dish is usually made with a combination of crabmeat, butter, mushrooms, bell peppers, scallions, sherry, hot peppers, half-and-half (equal parts whole milk and cream), parmesan cheese, salt, and pepper.
The bell peppers, mushrooms, and scallions are sautéed in butter, and then mixed with the sherry. The mixture is simmered until the liquid is reduced by half, and it's then mixed with the hot peppers and half-and-half. The mixture is seasoned with salt and pepper, the crabmeat is added to the pot, and the dish is stirred over low heat until everything is blended.