Brew 2 cups of strong brewed coffee brewed double-strength or use 2 tbsp ground coffee per cup at double strength — use about 2 tablespoons of ground 2 cups strong brewed coffee brewed double-strength or use 2 tbsp ground coffee per cup per cup of water. This ensures the 2 cups strong brewed coffee brewed double-strength or use 2 tbsp ground coffee per cup stays bold and flavorful once poured over 2 cups ice cubes and diluted slightly by the melting cubes. Let the 2 cups strong brewed coffee brewed double-strength or use 2 tbsp ground coffee per cup cool to room temperature, or speed things up by refrigerating it for 15–20 minutes.

If making homemade 2 tbsp simple syrup adjust, combine ½ cup ½ cup granulated sugar and ½ cup ½ cup water in a saucepan over medium heat. Stir until the ½ cup granulated sugar fully dissolves, about 2–3 minutes. Remove from heat and let cool.

Fill two tall glasses generously with 2 cups ice cubes. Pour 1 cup of cooled 2 cups strong brewed coffee brewed double-strength or use 2 tbsp ground coffee per cup over the 2 cups ice cubes in each glass. Add 1 tablespoon of simple syrup adjust (or more to taste) to each glass and stir well to combine.

Pour ¼ cup of whole milk (or your preferred ½ cup whole milk alternative) into each glass. If using ¼ tsp vanilla extract, stir it into the ½ cup whole milk first. For a creamy finish, gently pour a splash of heavy cream over the back of a spoon so it floats on top. Serve immediately with a straw.