01 - Place raw, unsalted pistachios in a bowl and cover with water. Soak overnight or at least 6 hours. Drain and rinse thoroughly.
02 - Combine soaked pistachios, filtered water, pure vanilla extract, maple syrup or honey, and a pinch of 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, pressing to extract milk. Discard solids or save for baking.
04 - Transfer pistachio milk to a saucepan and gently heat over medium, whisking until hot but not boiling. Sweeten to taste if desired.
05 - Brew espresso shots or strong coffee using preferred method.
06 - Pour hot pistachio milk into serving cups, reserving some froth. Add espresso to each cup and gently stir to incorporate.
07 - Spoon reserved milk froth onto each latte and garnish with crushed pistachios if desired. Serve immediately.