01 - Place pistachios in a bowl, cover with water, and let soak overnight or for at least 6 hours. Drain and rinse thoroughly.
02 - Combine soaked pistachios, 3 cups filtered water, vanilla extract, maple syrup or honey, and sea salt in a blender. Blend until completely smooth.
03 - Pass the blended mixture through a nut milk bag or fine mesh sieve into a pitcher. Discard the solids or set aside for baking.
04 - Pour pistachio milk into a saucepan and heat gently, whisking until steaming but not boiling. Adjust sweetness with sugar or sweetener, if desired.
05 - Pull two shots of espresso or brew 1/4 cup of strong coffee using your espresso machine or coffee maker.
06 - Divide hot pistachio milk evenly between two cups, reserving some froth. Add espresso to each cup and stir gently to combine.
07 - Spoon reserved froth on top; garnish with crushed pistachios as desired. Serve immediately.