01 - Place pistachios in a bowl and cover with water. Soak overnight or for a minimum of 6 hours, then drain and rinse thoroughly.
02 - Combine soaked pistachios, filtered water, vanilla extract, maple syrup or honey, and sea salt in a blender. Process until the mixture is exceptionally smooth.
03 - Pour the blended mixture through a nut milk bag or fine mesh sieve into a pitcher. Discard solids, or save for baking if desired.
04 - Transfer pistachio milk to a saucepan and warm gently, whisking continuously until hot but not boiling. Adjust sweetness as preferred.
05 - Brew espresso or strong coffee using an espresso machine or coffee maker.
06 - Pour hot pistachio milk into serving cups, reserving some froth. Add espresso to each cup and stir gently to combine.
07 - Spoon reserved froth onto each latte and garnish with crushed pistachios if desired. Serve immediately.