Step 1

Place all the ingredients in a saucepan, and heat over medium heat while whisking, to combine.

Step 2

After the sugar is fully dissolved, continue to whisk and bring the water to a boil.

Step 3

Boil the sugar syrup for a few minutes until the syrup is slightly thickened. This can take anywhere from 5 to 10 minutes, depending on your stove. So keep an eye on the syrup as it cooks, or it might become too thick.

Step 4

Place the espresso in a jar along with the brown sugar syrup. Add a couple of ice cubes, and close the jar with the lid and shake the mixture to mix and cool down. Alternatively, you can simply stir the mix with some ice to cool it down. This will also reduce dilution of the drink from melted ice.

Step 5

Add the espresso mix into a glass, and add as much (or as little) ice as you like.

Step 6

Top it with oat milk. You can choose to shake the oat milk separately before adding it to the drink to create some foam, but this is optional.

Step 7

Serve with a straw so that the drink can be stirred before drinking.