There are different ways to make the espresso for tiramisu. The simplest is to use a coffee machine and just use the espresso function. You can use freshly brewed coffee but make it strong. You can even used granulated or powdered coffee (a great option if you don’t have a machine) – use espresso powder and make it according to the jar or use a regular granulated coffee and double the strength of what you’d usually use in a cup of coffee.