01 - Place pistachios in a bowl and cover with water. Allow to soak overnight or for a minimum of 6 hours. Drain and rinse thoroughly.
02 - Combine soaked pistachios, 3 cups filtered water, vanilla extract, maple syrup or honey, and a pinch of sea salt in a blender. Blend until completely smooth.
03 - Pour the blended mixture through a nut milk bag or fine mesh sieve into a pitcher. Press gently to extract liquid. Discard the solids or reserve for other uses.
04 - Transfer pistachio milk to a saucepan and warm gently over medium heat, whisking constantly until hot but not boiling. Sweeten to taste as desired.
05 - Brew 2 shots of espresso or 2 ounces of strong coffee using an espresso machine or coffee maker.
06 - Divide hot pistachio milk between serving cups, reserving some of the froth. Add espresso or coffee to each cup and stir gently to combine.
07 - Top each latte with froth and garnish with crushed pistachios if desired. Serve immediately.