01 - Soak pistachios in water overnight or for a minimum of 6 hours. Drain and rinse thoroughly.
02 - Combine soaked pistachios with filtered water, vanilla extract, maple syrup or honey, and a pinch of sea salt in a blender. Blend until completely smooth.
03 - Pour the mixture through a nut milk bag or fine mesh sieve into a pitcher, separating liquid from solids. Reserve solids for baking or discard.
04 - Warm pistachio milk gently in a saucepan over medium heat, whisking frequently. Ensure milk is hot but does not boil. Sweeten to taste if desired.
05 - Brew espresso or strong coffee using an espresso machine or coffee maker.
06 - Pour hot pistachio milk into serving cups, saving some froth. Add espresso to each cup and stir gently to integrate.
07 - Top each latte with reserved milk froth and optional crushed pistachios. Serve immediately.