01 - Place pistachios in a bowl and cover with filtered water. Refrigerate and soak overnight or for at least 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. Process until completely smooth.
03 - Pour the blended mixture through a nut milk bag or fine mesh sieve into a pitcher, pressing out as much liquid as possible. Discard or reserve solids for baking.
04 - Transfer pistachio milk to a saucepan. Warm gently over medium heat, whisking until hot but not boiling. Sweeten to taste if desired.
05 - Prepare 2 shots of espresso or brew a strong coffee using your preferred method.
06 - Divide the heated pistachio milk between two cups, reserving some frothy milk. Add espresso to each cup and gently stir to combine.
07 - Spoon reserved froth onto each latte and garnish with crushed pistachios if desired. Serve immediately.