In a small saucepan over medium-low heat, bring the milk to a simmer and add all the ingredients except the pistachios. Whisk to combine.
Let the milk steep on low heat for about 2 minutes, then pour into a cup. Enjoy immediately.
Notes
Use full-fat milk for the creamiest results. Plant-based milks may be a little thin in comparison. If you are intolerant to dairy, try using Nutpods creamer instead.