01 - Place pistachios in water and soak overnight or for at least 6 hours. Drain and rinse thoroughly.
02 - Combine soaked pistachios, filtered water, vanilla extract, maple syrup or honey, and sea salt in a blender. Process until smooth.
03 - Pour the blended mixture through a nut milk bag or fine mesh sieve into a pitcher. Discard solids or reserve for baking.
04 - Warm pistachio milk gently in a saucepan, whisking until hot but not boiling. Sweeten to taste if desired.
05 - Brew espresso or strong coffee using your preferred method.
06 - Pour hot pistachio milk into cups, reserving some froth. Add espresso and stir gently to combine.
07 - Top each cup with reserved froth and garnish with crushed pistachios if desired. Serve immediately.