Similar to Cognac, Scotch whisky must be produced in a specific area, in this case Scotland. Scotch whisky must be made from malted barley and must be aged in oak casks for at least three years. Scotch whisky has a distinct flavor profile, which we usually describe as smoky, peaty, and kind of malty.. Many Scotch whiskies are blended with grain whiskies to create a more complex flavor.