When you shake strong coffee with simple syrup, whiskey, and heavy cream, something magic happens. It's called Irish iced coffee: A creamy, heavily caffeinated concoction that will wake up you and your taste buds. While you can certainly serve this boozy brunch favorite over regular ice, we're big fans of freezing coffee (or better yet, cold brew) in ice cube trays ahead of time and using the coffee cubes as your ice instead. When they melt, your cocktail won't get watery—it'll just get stronger. For a deliciously indulgent topping, add a dollop of homemade whipped cream.