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, filtered water, vanilla extract, maple syrup or honey, and sea salt in a blender. Blend until the mixture is completely smooth.
03 - Pass the blended mixture through a nut milk bag or fine mesh sieve into a pitcher. Discard solids or reserve for use in baking.
04 - Pour strained pistachio milk into a saucepan and gently heat, whisking occasionally, until steaming hot but not boiling. Sweeten to taste, if desired.
05 - Prepare espresso or strong brewed coffee using an espresso machine or coffee maker.
06 - Divide hot pistachio milk between two cups, reserving some froth. Pour espresso into each cup and gently stir to combine.
07 - Top each latte with reserved milk froth and garnish with crushed pistachios if desired. Serve immediately while hot.